Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b918b4da237eb0…

MALICIOUS

PDF

130.7 KB Created: 2021-07-07 02:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 11a5355e7b145d23c653362ed2350f29 SHA-1: 6b78b3cb2f5ecc1f89ab6b198a5b8c28b0fabdb7 SHA-256: 96b918b4da237eb07b51d9b7c682394c1cb68b0826dc2f92357be5a048d6c770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da04520f94---bosipavivumoxunanufo.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • 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 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://elsekmont.eu/userfiles/file/mosukajanav.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/kilufifub.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae2c6084c---nolub.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4e31c3ca---34309894609.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/79355977400.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2726a27f39ed553443e7e98fa12fdf21/fitulobin.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/93723343499.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbf5cc895---24724876665.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/63552365667.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xekuv.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mi2n7o6tno5meua5kstqtojep1/74794797839.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gotino.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/jowogupufevutowojaze.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/xefeguwatizere.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da04520f94---bosipavivumoxunanufo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902efb83547---sixowodotem.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/31711872128.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a825949ebc1af826bd1c065d7a6402b7/robisiwugimeje.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e2c904a7e97cd5e536559a5f8a3c7a6d/5063080951.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/87433836013.pdfIn PDF document text
    • http://ledins.lv/cms/file/35969319157.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/polomidasibizalejujozi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/81d3893b80a446c1060714642a2a8a8e/50340584298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=domain+specific+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 72004 bytes
SHA-256: 890299d916956e538d1bc288cdeaac96f10aeebd2d8d08311a52875aa2c552b0
font_02_sfnt_off0001b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B953 16788 bytes
SHA-256: 8afdb811d85f133e96a414c3dd8b5c3f94cff64c9007089208f56344b8da4c1d
font_03_sfnt_off0001e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4F0 10580 bytes
SHA-256: 66098d33ae3f3edd1fb5546289f2186007aa8700d7b385e1bfe191cb8b532fc9

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