Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f1960f73a30b15…

MALICIOUS

PDF

91.9 KB Created: 2021-08-01 07:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ee5277c6f8144111fbf9e0141733495c SHA-1: d5b51a5c4151dcddb681a980c1ea127ce1368e5a SHA-256: 25f1960f73a30b15210610332cea951a6323acf34813ca108a9c5dea1a7083b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=pocket+guide+to+urology+4th+edition+pdf PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c4f0d800b6f2d281ba33bacede18b2a1/roguvabozikefibo.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mewapubixefu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/089a0ed514c1dc04897348eb044ce0fb/21616623278.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d882ba71d2---pofazugigepefofinefak.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/97708935575.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d01026448---19565842912.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/j3lc9nmngkps5uitshrrs8uq2e/29707461042.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b81ee672---zibifavokowon.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/614ecaedb88e385c85603b3dbbc4bfb0/mozuluwinipibawinovemejuj.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/65547923285.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b0bda889---26719039963.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/sorajasawisidimozunebufu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/20538901151.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b86150c41---noragul.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/44160951035.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/90911747124.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c015e758e---babuvuvajeseferir.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f09985a02a77a99e3d09442f410cacd6/74177437211.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ea5ace30---81530046448.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/54318957278.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/lilukaxobabemizez.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63dfc5055e---68514134114.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d1a430c8adeed9371881fd8d8abd6b69/82972656355.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 17224 bytes
SHA-256: 1a8553595c2507a0990f0e02aeda1ee4dd1c9a99eaf46f234f2736b7c9984f86
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10956 bytes
SHA-256: 68f4046404b8e785a074c77c87f00bc1d88953178e90b433941b362fbbfd073e
font_03_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 20240 bytes
SHA-256: f7563d6b0eeb0d3901922d09c9419c4b70241db9b80afc0593920e360757b0e2
font_04_sfnt_off0001559e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559E 2696 bytes
SHA-256: 689a56853de31d896c803574c27525c1513fa96b3d2c4817c5509ef867d783e0

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