Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1332e42f14feb3…

MALICIOUS

PDF

79.5 KB Created: 2021-08-23 15:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee05730fc2486df1ede7e89db734ad69 SHA-1: 04f196328cf8345a62b89bc23a056cf9ebddebf7 SHA-256: 9b1332e42f14feb395bdc8dcd855309d23e4f0f52cf24f082baee240b4bdf5b0
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also be instructing users to open a password-protected archive, a common tactic to bypass security scanning. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=a+level+geography+model+answers PDF link annotation
    • https://istocdukkan.com/userfiles/files/suravoturapibewi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/farevirirabizamas.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/15979338681.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/48955607391.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f5ecc1f1---96100586315.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9bcda466de13dbcff75dd907af74bc92/36012587609.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/81238538161.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/54600602383.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/regevorusiradukiwututifo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9756c2101704f77a2fc9d398bcd04200/xusenel.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/wiwufuwuw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/079979b98c057afbac4d78e01106e555/riwofiwakefavopujepu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/pituvazojexadetiko.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/dejegabuxuzufikejotelu.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/14162842976.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9iv7l2mjcegc46q9khcqn53ioo/28876628697.pdfIn PDF document text
    • http://www.heksan.com.pl/file/javujipitovivejatawul.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/27335441135.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f924165b9af---raxuxetosuraxuruwirex.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/mukezumedabojodanotuve.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/96263828801.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/50872720893.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/7251162209.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15332548243.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 10896 bytes
SHA-256: 8bd33686a3a3e46cc474de7fe04d8b0619ccf2591b7abce8813dcf3e62063d5c
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16616 bytes
SHA-256: b46355d9b0126494c94597702a182c5ff85afa13a1f137818b183c3dcb5fda67
font_02_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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