Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e73c8671b726cd0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 23:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ae8cd3ec997c6fec956b1c68558cbf9b SHA-1: 4c59ac18326abd96466761c6aec4a4c04be62e60 SHA-256: 3e73c8671b726cd034b9513e0c6c9a81b0b5a8bb1771092ad1e4ba32b9d07fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting a distribution mechanism for phishing or malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5670064b3a441854b167c9c5bf1c2c38/zixaxarapivoxo.pdf In PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/05748ebd9ff6236658def6f7c9a5c5c9/54658262304.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jujufofufopig.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/9476906979.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/sapokorivuzukulajemis.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b3025eadc60a83d296dcee8543be3384/76772408763.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gihe2s8vmku5inulv30kgarplu/vobadinugavobe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8fd898624---75267828583.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/momikapigawodu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zapaseniwoj.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/verosuridabekaresoni.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/60713962249.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/14181504837.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/78924781440.pdfIn PDF document text
    • http://gyobel.itpublic/file/42503142965.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080802922a90---fasipozuzowolasafosikoz.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3sbq0dlvrftd66vcq7468veff7/76587275669.pdfIn PDF document text
    • http://apcmagon.com/userfiles/redovowaxufodonezinazose.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c559130d6---84863735046.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d060beac83522db50ed720a525ae3b27/92205953848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=materi+statistik+non+parametrik+pdfPDF 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_off0000c140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC140 16632 bytes
SHA-256: 2563e231ae814e8adbcba0501c0e0ee1fec6d311ae4241d4a7cfb4ed45f71874
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 10700 bytes
SHA-256: d19ea752352fb27072b840d8d7ce4226e4e441958a5a8b9780e9716a080671ab
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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