Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0eb563ed49a897…

MALICIOUS

PDF

106.1 KB Created: 2021-08-13 22:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 16736471168baf4f3fdaddcb92264c70 SHA-1: e757edfc610c812b1724fa6a627249bf1d84e6ce SHA-256: ab0eb563ed49a8978fa02b08a754940e555355413ab4c3de7e98f6031961d61b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=truck+simulator+offroad+mod+apk+android+1 PDF link annotation
    • http://sntaviator.ru/ckfinder/userfiles/files/28136228382.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218111114265614.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/varoviwojimu.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4534d870aa5e1b86376257871b29c130/zonanixovuzaxizev.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ba7bedadf6bf12682dd90c2845f52d1a/47659762749.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/14775655706.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/rufebuv.pdfIn PDF document text
    • http://babamoleskine.com/files/file/41325999321.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/5170751697.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/kakowivoz.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d1b138a0e0721ad962e96f5a62be4cd3/86671796022.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/55504335539.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a9fe9e73d44c19805330f753ad02a70/61821689687.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35d0e6189---6258682835.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/oge9dftqslacpalpm3jblm1kt5/gulodelibapobojif.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f91a827a2---mosuze.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8ff8s8b1q92va2uhe9bka9p6du/libegides.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/80745611359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163129a60ee---zadosokosotasupagov.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610da815ed897---biwiwixudikijolume.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/12916941958.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07504e054---65426365136.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/mosijadawokonar.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac4a36a9e---puvivazubejemulago.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013f29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F29 22556 bytes
SHA-256: 1994b3d28ca1e9631f9f406ca59138d9732e4c8406f7f6c723d4a4b94a7a4830
font_00_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 10856 bytes
SHA-256: d0ad18aa96fe4f597747abf23a32ccc80233c929ed33dc11e693b097f0752c81
font_01_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16716 19940 bytes
SHA-256: 558e8da211261f824ce5a5efa23ac514fe9c7b6a25cc1ed5cdf2d90f5507a902

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