Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d3640c4665279…

MALICIOUS

PDF

99.4 KB Created: 2021-06-30 12:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71f2b55b968a4d54a1ccbb587bdfa0fc SHA-1: 45d8230b96f1341f30eb2d9a931566cbf7235e80 SHA-256: 923d3640c466527949ee56ed6c591226c7d7dc3d9cb82fe710cab699501bf9b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=meaning+of+inputted PDF link annotation
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e181816d1f---93713514326.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4017961646---64760153263.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/giwovenazomasabubiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada84865e2c---63276058199.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/53874a66456b72c14b5131b7204d781f/97908963878.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3d6a4086263cb3b777f01980ee61355e/91708899837.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b33827232e35b4879b237761a0618560/4015053844.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/106ecf3998aa3c7b5f7ac636b08ee597/pafozatokezaket.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef808d6cc4---70558994486.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jivamade.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/60310594592.pdfIn PDF document text
    • https://medtek.vn/storage/file/xumoveralonogeda.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/b6uptpepa1dorijj92u8bq2eh5/nosuxekuzapasuwozi.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vg11diqrnbpm247kvmoik2elii/pejosidunovojelemugesuzer.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xivexutafapixipize.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f483d67798---fafewezupuvumesaviwis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe65dafd57---ganulome.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/84019157697.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/6276365713.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bbdc3a3c3---41410138251.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fc5619d084ba985c95a27ea5674f4d09/paxaropuwoboguvijikefof.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff90b8bb1e---bejevegopimix.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016075.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16075 18356 bytes
SHA-256: 2e2f4fd01f1cb76c35fc363c06b65f12255447ac7c5e130c8664be201214e03b
font_00_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 4104 bytes
SHA-256: f7bf8c6d3ffd02cbd27cf486addc46117a08a063f087e6c57234b6e2600145f4
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 26556 bytes
SHA-256: 9db868fd1d2a420d1ada34e70057efe1a3dd137a722404cc3bd68964e4efe592
font_03_sfnt_off000148db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DB 10452 bytes
SHA-256: 38dbb13e3c8889ba7e367cc0c9e7a2ad1574a5275360096f5bca6fbf44cdea86

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