Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd825b00740cf0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 17:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 566b99db94d22fc0af9d1c44aca85ac1 SHA-1: ecf640e23dc6c922a1fddbb3601098465279b0d7 SHA-256: fafd825b00740cf03ac1c5f36e0f9b311cd093f1251c308e78f3c5fb09867639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=creation+of+humanity PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/dd3eb0c63263d30c9e69109863af0f1a/waperi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ec970c553998d95f9017ea783096a3b1/puxukasotikexaremo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06f460c1c---24555430606.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vipejizaji.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/bepozulexidupunumorirub.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0fa89643---fomarevoxuxed.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe0f03fe8---45969397907.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tlo14hs43g8kh7t3b7m57kfc55/fekofomaxen.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/katoxarabixaki.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bc506424---xigasenexiduvigevo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/30506925719.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5s444i3hr29mrq3dibrgo9vik7/danimupanotalilir.pdfIn PDF document text
    • https://egca.fr/userfiles/file/41920684523.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14283a599---xafijigagugipamudeko.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vowaburegibegusujixinakix.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/widudigexovafoperi.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kuxixaxinewuxibir.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/69647997381.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/kokelelagixadibidorupuso.pdfIn PDF document text
    • http://alkanboya.com/files/file///tamikabaponidavovariguna.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/03537b520e8769258f123be0418c8563/kugakiluvogebekipujef.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/pisebewuvuvalekugav.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3deb4cfbb---93144891554.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ed00ccad27b488d19172ca4d1132e5c6/fijajajaromiw.pdfIn PDF document text
    • https://mytopics.it/uploads/file/43720394758.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 16628 bytes
SHA-256: 7aa07bfd3315805b6f225d0d74978e6c028d7ba2b47489de45fc633235373def
font_02_sfnt_off00013242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 10508 bytes
SHA-256: 3faa09d8379a79e18d2547d9824110eb0a402fb27ae6302d50fad1dd814be51b