Malicious PDF — malware analysis report

Static analysis result for SHA-256 b156914f7e01e1a8…

MALICIOUS

PDF

119.9 KB Created: 2021-06-29 21:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7dac1fa09e525318a4003e5c045ac05 SHA-1: aeb73fd6dc8d5899cffbdb8c9a57b76dd9c7d6cc SHA-256: b156914f7e01e1a894b1822bd4e34abb743e041da5112969b4580b34b9bceb4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm used for distributing malicious content or phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c195081ab36---delalupo.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9de304d971aeb5ffd7055cacb6471e18/ratolojevuk.pdf
    • http://daiichilogistics.com/uploads/news_file/pakalojovofoluzoloz.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c782046adac---33615106378.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091211c5a0d7---wekab.pdf
    • https://actor-conseil.com/files/file/nifikuvutefopekujokemimu.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079abf06ce72---95967116018.pdf
    • http://thunderstar.cn/userfiles/file/20210517001427966484466.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6547f3163edbd6387afaecf5f0062000/wumokuvebukapuresegedo.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca31d0354a---rufokafojoke.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/35db9d1038275bbce786981252d2f5fc/towatijajabilokolujagefe.pdf
    • http://asupuro.com/upload/save_image/files/fadoneteda.pdf
    • http://s-moonlight.com/CKEdit/upload/files/pevigum.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9640493c---jatojimano.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a5493a0d---ravolef.pdf
    • http://asfalon.com/__files/file/jitivaleg.pdf
    • https://preciseenergygroup.com/media/25240226039.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/murfu3kdmfqh7h97rghohvq9e1/2255245085.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97eec745aa---84799939584.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/edde1649b22ecff1cf2148fe4cab409c/zokoxoko.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070990931184---ronulumusufolexowat.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/75bfe9d28b817babe3884624d5d8bc0f/91439198265.pdf
    • https://gobelsprofil.com/upload/files/73999570669.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465591ea6e---malazufazobofasokemul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hall+effect+sensors+theory+and+application+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d5f.bin
c8527272eaffe71f50ef1372ee4e125dc8b08ca0990bc95c57e3550668b6695a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5F 10824 bytes
font_01_sfnt_off0001863c.bin
f5b0e599e1da899724249a7eb04e3a9cce6f78dbd011f8843b60da3e34e1a0d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1863C 19676 bytes
font_02_sfnt_off0001b832.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B832 16792 bytes