Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19bb200b9c88cf8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 01:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47ed6cd0774fa61f072743da927a36fa SHA-1: 81f18e3b440bd5dbbc201cbbb3fad1d90e3dc6a0 SHA-256: a19bb200b9c88cf8394a9fb5640bb7b8803d4111d408bbc37c3d1223a6a9c9e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious URLs, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mmprogetti.it/userfiles/files/82846022371.pdf In PDF document text
    • http://kochamsushi.pl/UserFiles/file/84177770972.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jogixowevanajixowolum.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dorupubeduralokawusuz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5fa9642cda189d6744edea4e0ee6de19/sipaseriku.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/pefufuwilexajarivewel.pdfIn PDF document text
    • http://gotween.com/userfiles/file///paline.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dadinidaj.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2pj4sr9teaevv5nm91dno95oil/95093079043.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6053b8oot9k9seg0hcaa4nh415/88436349679.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/gilakidijobezosap.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/66263631071.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210615_4CA6BA164DE7B68E.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/zowuguluxotogaj.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/80551160058.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f61869234---65726042018.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/63343553844.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2dmeumerebd2oj0dsr3bk36ib3/90823645022.pdfIn PDF document text
    • https://securitydm.com/slicice/file/2226188054.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/51596089385.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/89719003447.pdfIn PDF document text
    • https://e-room.co/userfiles/file/79682720624.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/80950198672.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/77b0f6ba0ab43cfd49e0700b372c3fe8/33977226209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=music+conducting+book+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10680 bytes
SHA-256: 011a8c54a562e90370960a50b969120e5c51fc5b4b24060054bdca2826fe8026
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 17928 bytes
SHA-256: c27ef257c19cc528a53e55181e679e3af9ac73983906395cf5a1e91774b5656f

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