Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef99df24ac3869…

MALICIOUS

PDF

103.0 KB Created: 2021-09-08 10:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9226c01556bc6468b7265637dae87f67 SHA-1: f6f767707b49f958e32327f961a31f4112dd665f SHA-256: 90ef99df24ac38690db05dd3a4b20abbab1a4377a196058005d3577574a1aef5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, aiming to trick users into interacting further. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=motomaster+eliminator+2000+booster+pack+manual PDF link annotation
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dbc35c23be645ffa7feda0c115f09120/kakizofemegijag.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/fb0b86d15b8c0016d583a00539fdbd1c/6807743542.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6aca9a4cc787f8e83e64c05b576cec9a/80061286061.pdfIn PDF document text
    • http://fedime.org/imagenes/24076885095.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/78780786872.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/bupukiretojumeliwezexuf.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/timop.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ebcad7a9deb0f3835f16b7683f452ec5/bezudadaworalosa.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xozirovexupepomo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/58c4b3c5467f13201a06989ff3a62ad5/dimirasojapixikifud.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51533904984.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9b4e0b117---vuserenuvazol.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/mejeratagipaxejolonapeto.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfc7a196c---femetipurifemojeg.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a469656a---bowelataxi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/titudibosuxi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef35c4bfea---bawovoto.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/99659970421.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/99765553157.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/taliluxejajavodomakoba.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/56580564419.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcafa69da5---8495509343.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095926598ee4---82842281466.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/68345051485.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/kikonabobiparufize.pdfIn PDF document text
    • 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_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 19572 bytes
SHA-256: e2984140cf5d189faa241c808f79184607cde829633eb5b3fadc9353d0df8098
font_01_sfnt_off00015bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAB 11104 bytes
SHA-256: 0c9c488ee98e4929ce5af9bffd1ffd45e17577a1e514f7210e52d1d2245faa78
font_02_sfnt_off00017560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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