Malicious PDF — malware analysis report

Static analysis result for SHA-256 1701fba88bf636e3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 03:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f6622f3daadfe64a89e3152bf6af1ad SHA-1: 7e120230e922c19e180dbbeef984b021b38478f4 SHA-256: 1701fba88bf636e35cd69599ab20bd78885620bb9141554e2bf8a80002cec34d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The file is a PDF that contains numerous links, many of which point to PDFs hosted on compromised websites. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://promise-land.com/upload/file/tetezujagapowazirotodos.pdf In PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dubamab.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/70231028407.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xakotuworosopomudemedo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7480e855fa---ruximejafazupogimu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq1rv038nkuvvcihl1pmc9va9v/37486403049.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/74734508326.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/woremofufofomerakobu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd4c7934a7bf55dd00aa3567d33abcea/35603224937.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210802160245140.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zupileresexafinelax.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd4f100f6---53186544426.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22649333415.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/sutudepunufurokidejusex.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/44210123525.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/63087658580.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/gafekomavuwi.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904063708.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1f1024c1---19713646393.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/25665135206.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca060bd5c41---70739145298.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/11586035330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=o+que+%C3%A9+marketing+de+relacionamento+pdfPDF 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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 11312 bytes
SHA-256: 95bf6ab4607090959854bb6376defd0a77c542b6c821c4062e2262f7c92aea1d
font_01_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 18456 bytes
SHA-256: 8fc628e922f3de7cb1542c81cd575ee50af3a8fd014d7191137be5ca7303b2c9

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