Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e2cf7d8ff65457…

MALICIOUS

PDF

92.3 KB Created: 2021-07-04 22:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e0cf349270aac3f313ca4368b4b4a04d SHA-1: 5da7dc99d813ff5d3cbd25f3dffe5faaedb93d33 SHA-256: a0e2cf7d8ff6545739c0c31fae37fc529b55b820187153d7aa59f059c2eb26c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters points towards a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=dst+woodie+guide PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/00rhunjn9nf6p61s7vo1ma4mv5/vixifutumiwukakezog.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/fikusevifubokatow.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/vesosusupesas.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d642a133---ravumuzamawi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/70520579575.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ik447nsrm34lkpqok4qc4rbsh3/1557473616.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a31798f6d605c136a13012abdd454a97/pawujasipubusizipobororub.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/galixaveva.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1a753f727d7aa583d9afab8895044e98/40835953940.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63b4d7237---57447721551.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed850fee3---1753343552.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c06a78c9b1c793270eed060ed7882c57/tigusoxipazavuje.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a7ee862e67463f249830822db4dbecf5/24698866714.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/12537330278.pdfIn PDF document text
    • https://artenika.pl/fck/file/kureku.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c059aca6dcac36dcd84c091c8e77e7b/23624186000.pdfIn PDF document text
    • http://apvn.info/userfiles/file/55925757931.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/58b2fc181d35d6bfee450f24bb9af3c1/30189649028.pdfIn PDF document text
    • https://bamor.org/userfiles/file/91013323287.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7i4ti7kcrnj2t5t861iutbv1m7/gogofuxixogulinedud.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798bd10aea1---rekowoketalafofoxivof.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/rufekupolevawikewelak.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_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 10200 bytes
SHA-256: 3a50249a4cb6bcef8c38b3d104ffea989765daac478802f3fd5409ba2176cec6
font_02_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 17212 bytes
SHA-256: b6656279b3d2f683ec60cb4320ad13c390cc78a7f8b32b25aeb4b86024ecf434

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