Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fa0a0c54eaafd5…

MALICIOUS

PDF

92.8 KB Created: 2021-07-29 10:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaf2252215dfcb05a100a2acddc964e7 SHA-1: c88279b7341eb044019622f6ec1056cdbf51f415 SHA-256: 37fa0a0c54eaafd53c71a2b8d2aebe5554b0a7fb070399ef0239c688e00d2892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=what+to+get+for+17th+anniversary
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/952c43beaf9e23e2cc0446e314d8ba75/3788111477.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/72638922881.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/571bf18284e4279eb5471d3661f98478/7926248756.pdf
    • http://24cvety.ru/upload/files/selaninixepu.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/fd9kh1lfgtkh2kq6itdps85rp1/83999275703.pdf
    • http://carsonpokebar.com/uploads/files/vibedesagafu.pdf
    • https://anthonygillant.com/userfiles/file/vutitukog.pdf
    • http://asianmosaicnyc.com/userfiles/file/kilujeb.pdf
    • http://kibbkw.com/uploads/file/tarule.pdf
    • http://daehwa.info/uploaded/file/69605931466.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160793a19ec695---xuvezuw.pdf
    • http://bociany.sk/media/file/sosorobujuredadulod.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f14fee194---41244000508.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c4117d2a---fadogonatofowuwi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a8246381---60983098077.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/defaz.pdf
    • http://sunnyten.net/userData/board/file/dumifuvobinifosaritejup.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160850b072942c---bogirusasedetek.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4d2916148aab5ddf6bdbeb87b35c70d7/taluwevalisazumipasilutul.pdf
    • http://jar-ted.pl/file/88078854083.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fe8eb096---wevesikamugazalulusaboku.pdf
    • https://fokusmedia.com/images/uploads/sesugituloxifakubamu.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ecuqlcuim27s37ilvphb7j152q/pizigidazobukopako.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda83d371b9---59823222398.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_off00010314.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 16792 bytes
font_01_sfnt_off00011b26.bin
7d6abf7c12df19908faff7952d07e27e47f92d49659a4ce4be434d15f2d64c65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 18140 bytes
font_02_sfnt_off00014b2c.bin
6ce4afa306f85124332155590ddf7ce1b6d9795bc1e26f43089e943b168c7b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2C 10724 bytes