Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7593bc9527b37b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 01:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f44161a40034637500b9915bf7bfb3e9 SHA-1: 255aa62026aa1541b0fccc47666c336a6694c70e SHA-256: ae7593bc9527b37b68555c004bd6494c29e1e4d6a85ce1a8cc70388e305b8259
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with PDF-based phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4fa6ad5fe---5799081631.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef34f37c3---rorafudezi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd8a85c9d---51867856374.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1mcb677p167offtkmq4li8gq67/zeremixavom.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp7hv57lb05h1qncpgbg64h735/fewopubefalolevekovosupev.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rorimiv.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d2dda01dd1ed613f78d8216ec81b8256/84650540341.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4ve6d6ij73qutvotgp4rb1r9c2/wanerefanaz.pdfIn PDF document text
    • https://promise-land.com/upload/file/telonetulenobem.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/11055995142.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35c1652e14---jibusurol.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/poxosexexom.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vebexiluw.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vetugudivo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e48727887a938722973b2a52049fe4ed/90454126178.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30f6e7889---vuwuradiwixapezonukeleleb.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/84756844094.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ceffbe79f---83337009357.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8044c96744---18816805807.pdfIn PDF document text
    • http://aweibel.com/Photo/file/morenegibopimelekisube.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061609302973499.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e5546139c8358dd741a62f2fb7afa33/73222562774.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b1ac0ec8f54fc6e4045773f820ce2476/jirelafupijezirewasoso.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d513f0446c---98296022867.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/48203506250.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l43kp83chd1gi6glu7mjo0rlu5/jisadivawenisajipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+keep+cooked+chicken+in+refrigeratorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10900 bytes
SHA-256: 9ca5533e25d91a9a59584995dd79b28dbc91c6b1134980001d4009be5ba6e316
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16556 bytes
SHA-256: 7f408e603371c334172933f738362d955c5dca478da9b9135f18a454e993d1ea
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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