Malicious PDF — malware analysis report

Static analysis result for SHA-256 185d7081ed716f0a…

MALICIOUS

PDF

108.5 KB Created: 2021-07-03 04:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 89f27f92fdff27defeea179129c8eced SHA-1: 5b1ebe4822189b6e000e301c9e9c6a7e80ef02c8 SHA-256: 185d7081ed716f0aa77509170f8ede9450cb2358e42b5cb731bde4ee02873afb
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://sntaviator.ru/ckfinder/userfiles/files/gabimunovi.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701505c60a1---33370009926.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f26f0e36---35032642743.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c902d822e94167955e30988899cc1cf8/zuvewofadonalev.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a16c469c---gamonofufezijifexotuzilif.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/52188228567.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d529e1938c---1513732932.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/3161467283.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/90070414208.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/bc90f9919602dabc51ed012d163d2db4/2065549568.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd954eaaab4---mufalinapirotut.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kuwemetifogadibi.pdfIn PDF document text
    • http://drironcat.com/images/file/77670997418.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ccd6e352867cf6a02c16753c723d901e/41566500497.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/nmqo2g0ko65hgttrrmu87josbr/bomuvodunifafasude.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6756124d1a---49083224592.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/29376236847.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb9021cc0---tejawegejalonolo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/lokugewufileserabajew.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/sekejuguregikanad.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2136eed9---79307177640.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e0a4d620---39007266690.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/205e55c37f1409fe3655a783419f320e/dolokesobikarajuxixotike.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee490ece0---60492713937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=subtraction+in+base+2PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 10612 bytes
SHA-256: b34c8dbf7472dc1ff17f2e985f244fbcc69571658415c36fa50ef4c3ea05c6aa
font_01_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 16208 bytes
SHA-256: 00b4f7762b7758215dafa7bf00094c56b9a4616bb418bfa467c5f82a056f1df3
font_02_sfnt_off00015953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15953 19244 bytes
SHA-256: f253925e25844b4f2c2adc449628bfd0bc565f119db63ffa5dd2ce3d7d1a52c6
font_03_sfnt_off00018c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1