Malicious PDF — malware analysis report

Static analysis result for SHA-256 7755ff5737cc2a09…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 21:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8f2441185b7d0b37249876c3f5e8b8f SHA-1: 1bc83e35e788b1c4d61738f2279e5166a5d461cb SHA-256: 7755ff5737cc2a0905c8587da198cd687434c005c69e7152e6f48a4dc03767cf
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. The presence of multiple link farms suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7d8bfca0---86977991983.pdf In PDF document text
    • http://185.33.116.145/~acus01/upload/files/zagiwajufujetewuwire.pdfPDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/zijenuv.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/72240737995.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/fozukigafotupuwoxoka.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/kugeladalivomanuwukamesip.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/falikowebupipudoforu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d8b6758d---vetetawizete.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109101809095184.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b83228e6---pogukexifisufadiv.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/89211593924.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rorigezitopepu.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/91419972555.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/numet.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/deluvokegowepopi.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/lofafupitudijirupes.pdfIn PDF document text
    • http://fotossc.pl/_files/file/34434702336.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912093047.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/10568568929.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d0a966dc---kuwugota.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/69635611630.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/27807587058.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/60853739937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=battery+saver+applicationPDF 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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 10600 bytes
SHA-256: 1e4795f236e91f48a244329b43ddb5e85f9d3c606f88d94dca6cd9e4f345b674
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 17316 bytes
SHA-256: 770a457f6486e70b78dc9a3269d605cd31734dca195a8a6ca9357d6db18cb506
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1