Malicious PDF — malware analysis report

Static analysis result for SHA-256 556effb0d418a59b…

MALICIOUS

PDF

91.0 KB Created: 2021-10-08 03:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 35f1fcce8358c2d478e0ec3604a1eade SHA-1: 49c339866042aee58ab0a03fbe878f99fb1b1f96 SHA-256: 556effb0d418a59b022295c1a786eb69cd4c0ded0d7d78582d18d58b0e46dcef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://huntic.ru/uplcv?utm_term=justin+bieber+never+say+never+mp3+download+free+song PDF link annotation
    • http://stefanourso.com/public/userfiles/file/74618654887.pdfIn PDF document text
    • https://ms01bet.com/contents/files/witumaliluwewuximim.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/deperovega.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/witar.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/janegekanobukitezenuno.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403eb56337f---ligavejozis.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/mowudosuwubetiwoguk.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/60dt1nhgog6t3i00lc01uaknd9/20088461543.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lowaw.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/wikawigeveduvikawire.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nebubijebupelojif.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4tqk32jup1iql7g35g4l3m9hk9/15103682622.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/wamun.pdfIn PDF document text
    • http://belloverde.net/emailer/file/mevifazibefolotowenudogid.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/57972176707.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac483092a---vobogunovogabujisapu.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/josunobuxopujutivul.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/24682636215.pdfIn PDF document text
    • http://a-pluset.com/userfiles/81990331924.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zuruzuwu.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/sodavirulabexesiwo.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/diziwiluwubemogokul.pdfIn PDF document text
    • https://cooperspick.com/files/rapino.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/86451043522.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/fipipadinidixoronaliwa.pdfIn PDF document text
    • http://sh-ether.com/uploadfiles/files/4447251369.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wurasagokit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 19288 bytes
SHA-256: e8609cb0e8be4f1d0c848da2b1d8bd79e5838a19d33910f1d405b34cf7832926
font_02_sfnt_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 11508 bytes
SHA-256: 837da8c2e2fd6f22235fa1c813acb1718668155dccf25733900a08124676a8d3