Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11378c129e41213…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 19:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e440edb6558c48a5916d4908d066380b SHA-1: 9f84cccb3e18251b38c8e86e9b173e5e79f0223e SHA-256: e11378c129e41213e5435c340191cd388c9491d0472909ebfa05c33826905e3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6491c39d---87997506525.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ah4nojc0l165cgh61b4p2heq61/felagilemexe.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4b5e00cb---parosu.pdfIn PDF document text
    • https://sanidom.pl/img/file/85069621754.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bhljteda3rrn3j3uucq8e46m4r/5709917470.pdfIn PDF document text
    • http://voijin.com/userfiles/files/lijijuzinanawufuripexilon.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/egno853uq16bou824pm2urdia3/puxalugale.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/12962042552.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/jotemomolujanuxixekupiren.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161129f0cd4fae---tuzawadorevunojole.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/34667870105.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/5814291232.pdfIn PDF document text
    • https://33mobility.net/uploads/files/foduneja.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/dumisukubaz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/54c49462c30576c8e11af6254c9e047c/4674117063.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/73e27505edc829219c8b648a8bf41557/67161056824.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0v3o1p61ujca2j2jcljreu23s2/88206664952.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/9dkttl049lenhv49msc2bkgbo0/zipaxifemotowal.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/buwijosuzozejukorejemok.pdfIn PDF document text
    • http://builderall.info/userfiles/file/22993706292.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/15f88d960268e817f035a2baac5c8099/62895935167.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3b6db7685d8eae1eaba1c147e0f01d95/50843416898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=1+o+que+%C3%A9+felicidade+para+voc%C3%AA+brainlyPDF 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_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 18888 bytes
SHA-256: 9d44e7f21d543252d05802c1a576b21a9b1455c9e82a15115d65835650ea9880
font_01_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 11180 bytes
SHA-256: 9e01cb0f561273d37aae5b422b05b77fb154b04645cd4bdbaf3d6525ec87b6f1
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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