Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3352eb49e970396…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 02:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4012a5763a1e4b9092368028067a2796 SHA-1: a2eb45b6fd778fddec632628bc1c8d208db8975d SHA-256: b3352eb49e97039685d78cbf537e68954ed3f494dd0eae025b394aa864ad9bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, including links to compromised WordPress sites and link farms on disposable hosting, suggesting it's used to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://archism.ru/uplcv?utm_term=bigo+record+black+screen PDF link annotation
    • https://intersensor.ro/v2011/Files/fck_upload/file/geguwelolawibumidajuput.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/98725841910.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jeletujar.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/tozuxabofuxugen.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kevofakukowedusanudal.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/80550361153.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/43662559500.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/90078010782.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_182852.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/begejolojuv.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284164f582---45517061683.pdfIn PDF document text
    • http://letdentalab.com/img/files/givupulexebebapanupuri.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/bazuso.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/45558854681.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/21039555941.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zobigaxadufiwaxud.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/22114594516.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/59665780457.pdfIn PDF document text
    • http://benly-carson.com/product/files/63299411384.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/66494570078.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6dfeb7d6---kegokido.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lagoledupixuboradenu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001338d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1338D 17468 bytes
SHA-256: 9e4af6ea45fe4cefccfca24ce51c0a103884ef3d7af16109ccc3d2d4e5d49794
font_00_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 18052 bytes
SHA-256: a34a27cf13929e81a3d95a99d124afde7fac5349fbad81d59ceeedea25097739
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 10732 bytes
SHA-256: 42ee204c8a01a5a44162cfc168890e5e5af1a8049eb2a05937eb22ca51406008