Malicious PDF — malware analysis report

Static analysis result for SHA-256 048774a22b07a95d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 16:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3250f368a35377509894f5408b965ef7 SHA-1: 0866d7db782af8ac12d7098132a587add40b5bb0 SHA-256: 048774a22b07a95d2990f55d5b883a5c2481d662993ad3d6decff653d5eec8a5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous links to potentially compromised or disposable hosting sites suggest an attempt to download and execute a second-stage payload or redirect the user to a phishing site. The heuristic 'SE_CALLBACK_LURE' strongly indicates the document's purpose is to trick the user into calling a malicious phone number, likely for a tech-support scam or a fraudulent billing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_013603.pdf In PDF document text
    • https://derfo.info/resimler/files/14632510502.pdfIn PDF document text
    • http://juha.be/_files/file/9596657317.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/08cfe67a4eb7dd9002f4376d1f77e926/zetaxesomuki.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/sixarazolovawidebok.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/34312510682.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/45849814274.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc85bad7e38c32b50800228973294b32/dafibefavarejamemaminap.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630783671.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/norupefewiguvi.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/61488516774.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/77208356957.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/kigexizopixuvokokiteruriz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4b07e6f759b4665d589592ce862ce65/veragovusiridotegegosal.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/vutuz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/707442c9eb8752aec47aad00dfcc279a/nereludedo.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/71693892449.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/taxufizagijusabepile.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/73439226225.pdfIn PDF document text
    • https://theipbuzz.com/images/file/42708166453.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5e207ef7---60400957718.pdfIn PDF document text
    • http://erictex.com/ufiles/files/55926172665.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161409e0240897---94791570343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=waptrick+killer+bean+gamePDF 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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10656 bytes
SHA-256: 792e59d5262f69b7f5711e40ce181b8d4416cfcc7d0481fd00e084a107a4b59d
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 17936 bytes
SHA-256: accb181778869bfc9bfdaa12a1c854673d5c6c6b5479f6a11e531f74dbb105f0

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