Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb13f46bbec5d78…

MALICIOUS

PDF

97.7 KB Created: 2021-09-14 03:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71452e71cac6a2b83cca9f0e70d440b8 SHA-1: 88231e409837ae11ecb6afb99edf8ad2f298eebd SHA-256: fbb13f46bbec5d787f1ae97990f10d0803373508fcda0d50f1587481f76bed90
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. While no executable scripts were extracted, the document contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://skiflogistics.ru/userfiles/file/18728944643.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc46db849---marowafajib.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/tazotaxaxonopunikawozef.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8d4967113d48a9ea22c544af40dda7c7/93518886222.pdf
    • http://nsdadventist.org/FCKData/file/mimapekexolezago.pdf
    • http://isspskola.lv/userfiles/files/xavokitokevekasilipokug.pdf
    • https://stiff.pl/ckfinder/userfiles/files/napirofalitasagituxajawoj.pdf
    • https://oceanflowerhotel.com/uploads/image/files/xewojemasuxorozo.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/92436651985.pdf
    • http://dpholding.ru/uploads/files/70957434875.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109140904444270.pdf
    • http://benrassam.com/uploads/files/zugem.pdf
    • https://mkontroll.hu/File/64298557421.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/wazosika.pdf
    • http://birizgardenhotel.com/userfiles/file/53106327483.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/73333131045.pdf
    • http://studiostocchi.eu/userfiles/files/6096500982.pdf
    • http://dglytbt.com/upfolder/e/files/20210907013332.pdf
    • https://www.netcorp.hu/data/editorfile/49186927655.pdf
    • https://dallaslandscapedesign.com/media/files/87882612985.pdf
    • https://alstar.uz/images/shared/file/73866945037.pdf
    • https://dcoderesearch.com/uploads/1155650815.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gigixekefagovaderexur.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc7364d9d---98445676817.pdf
    • http://kadh.kr/bobod/upload/file/mimawirop.pdf
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=super+saiyan+goku+cell+saga
    • 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_off000114fc.bin
73585294973938d7d8ea0c1c1a23b7642ff94bfa31263cb4975a64d9ca336dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 18800 bytes
font_01_sfnt_off0001467b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467B 16792 bytes
font_02_sfnt_off00015e92.bin
38076516ca64574121a650dcce7a26c02fd31c3ea7511bd7653d2833ceabc0c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E92 10832 bytes