Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e9b2fc003be8aa…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 00:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d806006e6de2377bb53272b29e461255 SHA-1: 34d2056c9e25c4b10bdc5f9cb5527caebc445697 SHA-256: 91e9b2fc003be8aaf757ea8a77bb67b1139e24ecd0846658f1e41a100db3ae99
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The primary purpose seems to be to lure users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/7cd8407d17d17523a21beba4e0a7aef6/61624039632.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3342fe5c---12907411503.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/576b9967b730f134cc96871051c6d3f9/74408182086.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e6d868---87726820632.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/63c4d320c80dffa45cfbcd4653d8845f/98372824798.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b2f45320---kuveli.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/si1gp93l35j4448ijnt83q6cb1/gabitewoxevikum.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e92e2513---bobivagiwodikojekuzeju.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ac0d7b9f---89893324722.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714fcb84d07---manow.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2e1f4beeb7945ab8043fe262cb7fa411/parevikulozamivipuk.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5627d99c---maneritugo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17d22b32c---lulonapuforukavowi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f650a6c3fa---jixojebubuvovu.pdf
    • http://3suntech.com/UploadFile/file/20210604225906951.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608720ac876aa---sebemuferowojuri.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/hm6sevd6oapgmkqhs74ko1qal1/29101682243.pdf
    • https://datajournonepal.org/files/tuterowitefulel.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/27456098348.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/fedorumufapujarokuzozolim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+definition+of+biomagnification
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014166.bin
98fad700b2b2dfa36fb96b5a1d0b3eef4ce4e40df59b8873494a09d448fb1b8f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14166 18420 bytes
font_00_sfnt_off0000e299.bin
45bff0f0e51f5ff9e8f6414de79371d17013ed80fd3148fbc310313ad71b7989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 23204 bytes
font_01_sfnt_off00011b11.bin
2d08cfd63a363d6bf199c8fd1fafe7aaa0ef3c06610b098b09f13c9e8cb1d0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 10908 bytes
font_02_sfnt_off000133ec.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133EC 3464 bytes
font_04_sfnt_off00015f65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F65 16792 bytes

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