Malicious PDF — malware analysis report

Static analysis result for SHA-256 1636dc1a6459e46d…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 19:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499e74c8dd3a1432eb8a9a75ca4c7ee2 SHA-1: b5f4e3f21551755ecd74c8be3d82cfac2b46e6cc SHA-256: 1636dc1a6459e46d447ad0c1e4da01e1b4b4be4fc597b42ffb88dffb03416a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with common tactics used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=the+extra+mile+golf+clash
    • https://isabellepieman.com/userfiles/file/96702881599.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7c4b5bdbcd789a7b4c2d6670e7fd290e/96642672117.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a494d95b2---padorunurerafe.pdf
    • http://arcenevents.nl/site/upload/files/11768922208.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a875b35f1---63238325593.pdf
    • http://kfnmdg.com/upfolder/e/files/20210604101952.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfa68c16a---49488511609.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097498041fad---tejularenaru.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9083da9451---32205750017.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d820fd9b---fizetotasigetubetefexot.pdf
    • http://fobas.cz/userfiles/file/3367029594.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f1a453c8cdf53d4d53878d1a27a7fb25/vexanunimasosuk.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607879d706784---23958413073.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fe99b1fe148d6e01934761958f16917f/57337779404.pdf
    • http://willbramephotography.com/fodokujul.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d249becb3---sazijigemusibonotemufus.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8290200b6---sagopalaraz.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085270621bae---55923993074.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d8653d82---8356962440.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce463118a---tiliwarixefamevik.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc37d7376---sepowapebozirur.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/13461077448.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aebdb1a7545---dojajifanatavumivevezosoz.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2cde0c1765fa149d56fbb835685568e8/42762265466.pdf
    • https://hospvetcentral.pt/site/upload/file/31690806011.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 16792 bytes
font_01_sfnt_off000102d3.bin
71249f7d7faed9557ff8bc61b06f8d831be08b00523000992faab978597df72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 17364 bytes
font_02_sfnt_off00012fa2.bin
af3d5c49520f69cd57de5909ef27a089499c4ec64bd4de761bf56c347fcd33e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 10744 bytes

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