Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ccdb9440396eec…

MALICIOUS

PDF

122.6 KB Created: 2021-06-28 20:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afe446535436fdc834ccc9c305ad72af SHA-1: b051026a40e4868b2b2490ea1157ce8422e0261e SHA-256: 97ccdb9440396eec43d28866aa6a8d215f8e3fb1cf81faffd32fbfe6a91f997f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2bhte0v1sdt3kkjmje2deijqt6/11098328885.pdf
    • https://grup-insaat.com/userfiles/file/20146069755.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6ebc99fe---teratozewudilivokamewag.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4ee16c6b---tufodavip.pdf
    • http://sl-light.ru/design/img/upload/file/giwuvovamemexifewupanot.pdf
    • http://abacusnancy.com/userfiles/file/vonovusotezazokode.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/af43e1c975ed940dfd49818ae413e3a0/madezonakofazesuvawo.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910c266ac---nirane.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m8b82shcof0cjmdvocf3196653/guxojanebijesekodozoda.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/48ff2aac4f8b27060f9088de352a5755/dusoxasatavuwatedite.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39614542a8---83895579300.pdf
    • http://sport-way.ru/img/file/zekasumugiwiwisedegog.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fa049ca1---30645358980.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d7421ab0---1629443312.pdf
    • http://al-bandak.com/userfiles/file/xupovaz.pdf
    • http://hiredriver.com/uploads/assets/files/xobomiwixovirowawirup.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c3671d8d---10170910515.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafee53b181---rivuputufesifor.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jk5ogm519pv0unfq6svti8moap/fekezepobikutelidezaf.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16094063b72d14---72679338879.pdf
    • http://unipsyclinic.com/userfiles/file/20210605022547.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/en122qcft58a72c1f9r6s8op80/sokitidapole.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e9418567---mikavexamuxug.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fce8tr84g2g1694e80f9lcu2e3/goxonorebudiwabekatosavir.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430163708875575.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607542827d856---30403163241.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=demons+and+demonology+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018020.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18020 16792 bytes
font_01_sfnt_off00019832.bin
9148321c312477365b5ab381b089dfdb0c66c81e0cd7599fbf8655fb8c97af69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19832 16976 bytes
font_02_sfnt_off0001c47e.bin
5a811e4afc5a6c2a9aceb0cf8ff691fb29dd5a37c874ad4679073406ba25f305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C47E 10664 bytes

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