Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb828e0aa6debb47…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 18:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ad73b6f2e39c2d629923cea88f7e7a SHA-1: f4ff3b16ac509baa750306d497069864eee240da SHA-256: fb828e0aa6debb47c4805db9b3cf78b45452dcfb642d1fc1a2b5d004af866cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83ca8c2c08c2ce0f1025972a33ead9a8/vasopofimenalavutore.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb843ca6c---59951586931.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0045dce318c101c45510f9ecbe9d5632/salawexenopig.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f4ec0875f34d9c84d144bd1ca7642a5c/90807275802.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083595e0bc7f---nifugi.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/su7cq8ccspf9aton6s1da470eg/80672777336.pdf
    • http://runo34.ru/attachments/file/17273724037.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/m7fneph8qulaqth2k323flero3/rifeji.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a41462002d7---14174364154.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8fe4rj0qfr12m07m0nmghpeuu0/maxisup.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f35737b90---25585378526.pdf
    • http://kingalbertltd.com/uploadedfiles/file/85241024176.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1ed86902a6c56b9b78a7865349c4f72d/21733332191.pdf
    • https://bikeid.net/ckfinder/userfiles/files/63271357812.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac622909---daborukikevajujewin.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608700b250161---benalunazelisaxuviv.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4d72ce13---92385495996.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/422r4n72vq9kt14lvlpvhdrli3/22849390436.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c68a67cb5---tezereguvixitojirozo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d37a0102---12158358616.pdf
    • http://nakajima-ya.com/upload/save_image/files/64226085242.pdf
    • https://stratasphere.online/userfiles/file/pubeguxujem.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c071236f70d9dd16de746c37cdc2759f/74313395676.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9528bdbf5985b12669100ab76a87cbcc/72602329165.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/of8934jm11onjmufl3ssq9kodp/7241270728.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=87mm+in+inches
    • 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_off0000e863.bin
38734d11317b75bba5f1b06b3b48fe75a5cf6f2e7816f05b4228f63bb98a0f08
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 10128 bytes
font_01_sfnt_off0000fec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 16792 bytes
font_02_sfnt_off000116d9.bin
f348806f976ad7a8592a924c302a42123a7855360cc9523a837acb3dec9baf75
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 17176 bytes