Malicious PDF — malware analysis report

Static analysis result for SHA-256 54879c11fbbc74a1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8926d965b9ba5735b4416f3b9d41921 SHA-1: 5ffdbd0dc675760fe28e247e851e9e85327025ba SHA-256: 54879c11fbbc74a1426ec0ed225ae67b3188fdeaa2f8da137c0d6169207ff7f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may leverage embedded JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=office+365+not+syncing+with+iphone PDF link annotation
    • https://czus-lukasa.sk/userfiles/file/94225290761.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/wikisoma.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/83357148248.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/muladewasisumaroseviwor.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f36360f8c---lamufovor.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/lufipoma.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/49587526761.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/96971487829.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c664a1be---95853427189.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/bejuzeliwurin.pdfIn PDF document text
    • http://lovesenergy.nl/file/kogenokiwodazi.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xelewogaroxiguderesiwosi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/94688005873.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/jotevakuv.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/jemogaximanefi.pdfIn PDF document text
    • https://protum.se/file/60927369850.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nekixikopejamat.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/89450619797.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/lodununipuvis.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/tokus.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///20712205817.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/jijitubupajalo.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/38033568670.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a987d4aceef6254325ba5c0f3a812e05/bilagabiwabewolagudofi.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/36612153300.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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 18056 bytes
SHA-256: 31753eedf6a138766f73103e1587b5c1dbf13613778e3a0fe07c23af30461b06
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 11148 bytes
SHA-256: 355897ed532aa09826e4bf1a2647f6aa7d18118b89844232bb1854403aa7ba53

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