Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4c2dc57046e90c…

MALICIOUS

PDF

88.4 KB Created: 2021-09-13 14:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d0bc5adde67a121dc2127fb0f61664b SHA-1: 91b3a94ad8040f52894655c30668f02be3797971 SHA-256: 1d4c2dc57046e90c40d0d83a70ee9b6e36ca65eb57a2819e40efd272c8b19482
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade initial security scans. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a larger phishing campaign, potentially using JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 http://mosjob.ru/images/file/56047872767.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f1a7dbe58da2216964e6bcf1220fbe50/89431549358.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/43917710763.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sagesamap.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/73412364030.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/23387016153.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902180937.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/87774020637.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/79029965872.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/56778477102.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/66522244706.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/kazipesogugi.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/kikafujevuxuzavedamore.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/26081590600.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/23530901350.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/46823554296.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/fomefu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dazufapozir.pdfIn PDF document text
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d79cb5ad---jewumizekolenipivuzoduke.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tidebimadidasuferorera.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161389ce4b1705---tatozosome.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/tepemelenino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=missile+command+atari+2600+romPDF 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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 10936 bytes
SHA-256: 7fd76a4553beb2ae500f28eb473c6c1666ed5345efe5ad366793a10197a60167
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 18236 bytes
SHA-256: 0d9f7a0d2d9661b35be4b40999fd20df5e7c37e970ccf40a17000e75dc83f7ad

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