Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5b355fcc84076f…

MALICIOUS

PDF

95.1 KB Created: 2021-07-25 01:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 439d3c89f96e4d9b748ae88110f8641e SHA-1: 14645d55804e2fc4d61944746e92c0fcafba00f8 SHA-256: ee5b355fcc84076fe2737ccb6615df68d616998ad56d05e9f7561f19468e9634
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The presence of a 'Callback phishing phone lure' heuristic suggests an attempt to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aae84cf3ef5---32421296146.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2b196p9jfc680bc5e5u9qij0v7/pefodesusowe.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tosumujanumutevilos.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869faa6b3d4---vagozuve.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xoniwodelinalebe.pdfIn PDF document text
    • http://fitviewer.biz/files/file/buzufipuvik.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/xemilovenejozitumif.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c36bbc63d---13761107577.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/kazor.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/91959841104.pdfIn PDF document text
    • http://eichler-kammerer.de/26577179104.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e2334499e---38373742308.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3d174cce76ae3c22f1a362559f79a93e/wulokozavofumelux.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fepakeludedivefot.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/84561211798.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5fp5v3t5q1k4utuqtu22j9bl9m/jujusasotujelabog.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/67163249964.pdfIn PDF document text
    • http://kisito.com/userfiles/file/lipafuliwimezafinikam.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/11765260280.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e9baac2b---vifoluderos.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ibdicqeju40s180gl7jqglmd6g/xatakobazuru.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jonamagokezigegadoz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc69cfa8---8812614016.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e532665ccec0534fdfbbe9e85b055095/9331283130.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801777123e2---dizitasotelaxasokidoto.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/61554574295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=synchrony+bank+amazon+credit+builder+loginPDF 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_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 18680 bytes
SHA-256: 102e062e4005a74760907bd19699be7fdb50d965f1774190c3a0cd2b9d10b533
font_02_sfnt_off0001544a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544A 11228 bytes
SHA-256: 31aa8ff2029c5de31805f278e51354517ec87926f98d53672fc9d5eade87883c

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