Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c7221a089a75b5…

MALICIOUS

PDF

110.3 KB Created: 2021-07-01 13:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b08a67b3c156056f7e16c1dafd320056 SHA-1: 1eeb62f7246fe10c1adc87b3a1254f043f4bc6d8 SHA-256: f2c7221a089a75b56eeec654ec079a7cabc0bc0c0e465305d49f38e0b004355d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=reactants+in+an+enzyme+catalyzed+chemical+reaction+are+called PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609532dadc519---88621885327.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zoxulovopelobu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/jikijaxazapa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160757107d224b---30273487240.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/79762820424.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3d524fbc---vekubomapaketi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0a4eb197d2288cf8e36aab7fc6020198/19171921742.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607463b799850---sapedewulipedaluw.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/nusobe.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/bojulupusibaxawes.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d312f8e4---bovexajoletunowokezamiro.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pl8st5ga3e9c4q1p2p3imeisie/nanatipipiloteketijawemo.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e973162913938a34b5b991f810ad15a5/95649094937.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/df3463112646d9699429d30cb99295d8/pajesame.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22457068064.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/zaxafu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac61325a0e---zilamakoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0ad15e300---16904091112.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061808114873499.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a7e038315e11a7a430192f44261275a4/18346458526.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8t1frrgia3ajvpvohode62vk07/47538175972.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e20lf1hsfm1f56mcnnniqrn56v/menudubovowe.pdfIn PDF document text
    • http://learningkey.org/userfiles/zujapenovigisixus.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/17656793318.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_off000148ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 18460 bytes
SHA-256: d97e1997b5634d5ca2701784d6bbf9c3c828752ea70a0460afcde0e373a03d69
font_01_sfnt_off00017a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A32 10856 bytes
SHA-256: 276fb83362c3fb6a16ecb0eba2bd7e93def5ea793e80032ac0134fe601c5b52b
font_02_sfnt_off00019321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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