Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dc0b341a807cbc…

MALICIOUS

PDF

166.8 KB Created: 2021-07-31 13:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5cddac890a31ed9982872d688f3e3a85 SHA-1: 5d9741bb2f5da715897f22def6f93bb4cf8171bd SHA-256: a1dc0b341a807cbc8b47b7a6d5d968968e9054cbcb5da787f19bcb2cac78d96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

Heuristics 6

  • 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.
  • 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://self119.net/upload/userfiles/2021/06/files/210621184230.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/55316109675.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p8pllq01lufn8t0boe3rdgc9lu/89340060991.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104167313922---91141757559.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/sezalatuk.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096723bdad97---gakiromufebumabum.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e2173099---73059891873.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021729221426110.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/diwuxomizetiwasirazegupo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/22258216987.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb3a46926---56216727289.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/3438215989.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9c86e84824804a7c49fcc34580dce957/87143603085.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/82d0fe1f053c456265472811bd7c4df7.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a08817f30a2f300d337ac2dbe444349b/mopavawutufosoxunezofafa.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/4479715944.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/pakuxezesibosejofu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2f85b30e68a150d34360d8eabf829b8d/larexepizaziguwow.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/10860138365.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/pilanafito.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc9d91a0b---2390800357.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51e2b46923d046c65683ec5b868ef4eb/88088506169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exercice+quantit%C3%A9+de+mati%C3%A8re+et+concentration+molaire+secondePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000203cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203CF 16188 bytes
SHA-256: cff13d2b7e8e832183d48191555c2f6cc6e1e9ee2bb427d40ea948c48fde5423
font_01_sfnt_off0002197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23191 23888 bytes
SHA-256: 63eb359a407bb33e05ef282e7d5db41f9f245bde0122e95b14eb58c706f4fd7d
font_03_sfnt_off00026ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26ED0 11172 bytes
SHA-256: 4b1ff7cee451b417ac3d993dea658689c73be9e75c32deb61c4626e617bc5621

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