Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a6c2b103a0cc00…

MALICIOUS

PDF

83.9 KB Created: 2021-07-07 00:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0ae2231fa844e817d9b30ca80cbab14 SHA-1: 4288f2dd60442870a8dd298b14a129ba1fe6eeaf SHA-256: 50a6c2b103a0cc00bbb1585a0e92fad569e7666213f2b52ff46efa0d08d588bf
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The sample contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8806029a7f6008eb05f86a1e6ff5d78c/kedufuvowenojipabi.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a767a529ee1---laxuvopilike.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/fubijegogufu.pdfIn PDF document text
    • http://thefertilizerequipment.com/d/files/lutiwafijano.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210702_57D36C01D20E49FD.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c1db49bd---jekofufinajejile.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0bd032c87---73456034677.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/41174303075.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f2ca4ed33560ee2225cdce2a3f1400eb/gububisobijewobavexokatem.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb6807d7e---41995909216.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/safoxumipurapopo.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/59208469384.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bn4iueohqknc1om6p85c357rd5/lofofetus.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d29a3c035---tojorudinokukamafuxor.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096816e2af23---12590328177.pdfIn PDF document text
    • http://yilip.net/userData/board/file/13406451084.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960541629c1---wabepejoje.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/57096517337.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dfb37f68a8d7366c4411b21d72399829/51142895376.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3e2de136b18086e4059cc601b64762ab/ponavagigag.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d33e4a73796ab3fcd186f8c38dceb915/nasobajaralafalixuv.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/78459441166.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/71915017127.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1efdeb3f6---63173137346.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021618315207718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=israeli+couscous+risottoPDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 17824 bytes
SHA-256: 40f4b0666c8c7d672b1b0710ff0cfd283ab21f3f3f3e81444f8fb10857113a66
font_02_sfnt_off000129e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E4 10168 bytes
SHA-256: 71ba5f774d87f170ee10462a02c01e0c1cca3bca27a73503f34fe177734c805f

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