Malicious PDF — malware analysis report

Static analysis result for SHA-256 b328556e7b3bb29d…

MALICIOUS

PDF

120.2 KB Created: 2021-06-25 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc4176c6c77f7a864c34954ee9ca5d54 SHA-1: 0731d35aaebe23d614fe085b212ef5bc5341fff3 SHA-256: b328556e7b3bb29db1c162c190c8f677d183e4d1f01a83f6e5a6beac8230358a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other potentially untrusted hosting. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h0vau0ovi2u11ck2m0jj897bh3/nutozaboxexifefop.pdf
    • http://adaviestransportltd.com/userfiles/file/zavazasoma.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9812f06869d042f331096453e298dc33/66976480535.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/40930407120.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a200c776d31---98338288031.pdf
    • http://marcth.pl/media/fck/file/2623451484.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01f444302---bixojufaloxonavosako.pdf
    • http://ngor2-3.com/file_media/file_image/file/41021189864.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486838de42---tisusikefeputakoxopoz.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fs24ekqvnel3s04o6fauvk2d36/nukokaduwupilugizuvuxuwa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b94d6ad0---88376238116.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b47ceb5eb5badc06af4643086487a090/guregijanetobufole.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ed812cba---60069521782.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083444902698---56111152336.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfc110bf7aa62b6c8e8cbcfa5a187dc4/sisaluzurazoziron.pdf
    • http://7166867.ru/ckfinder/userfiles/files/gozipeke.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a0e11ce5f2e48d58f00bfe49f146a837/73750991169.pdf
    • http://taiwanglassgroup.cn/userfiles/file/63573015393.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be775a79b6b---rugowimo.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c69508c7dad---24325138178.pdf
    • http://iphysiology.ru/upload/rapabanizazuvuwazanuv.pdf
    • https://vicotelecom.vn/static/source/images/file/80858116870.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160746d18216c4---xowukexexowupurepuzemanu.pdf
    • http://www.hgbehringer.de/img/files/files/wegemus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=human+centipede+streaming+free
    • 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_off00016de6.bin
7120d3bfe254952a8a7408c8848f734c08a461d5781faf40fa63943cd8cbf3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE6 19460 bytes
font_01_sfnt_off0001a0bc.bin
d6a137a834a0c0032de168c7ac153fc07e7b8fa267668d4e92e0ca80ae19884c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0BC 10888 bytes
font_02_sfnt_off0001b9a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9A6 16792 bytes