Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4f41a92270582d…

MALICIOUS

PDF

91.7 KB Created: 2021-07-16 03:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c22c09de129598a0fd4fb8da1677cb51 SHA-1: f8e177cde5c46d097d0642dff4884ad73d47bfa7 SHA-256: 1f4f41a92270582de22a5a2b05db4df477d8f5b96117b9278ae819e93df1efe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, likely intended to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=call+of+duty+mobile+apk+download+highly+compressed PDF link annotation
    • http://ferramentabelleggia.it/public/file/95727409734.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ttnja8c14lngu9vn2180r29q65/bepudujidex.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/75861485590.pdfIn PDF document text
    • http://jsdarvin.com/files/panav.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a8f7b62e9ea91f4f463f0b0279fec0b0/fixopodinezugum.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa7d11111d643bec98bb881a6717f393/wanavaxosi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bukupiluvifuwanukef.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778dce1d05---sipulizalan.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/74593849621.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kovifama.pdfIn PDF document text
    • http://dogable.de/userfiles/file/laruxowelusamukorativem.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/32888879691.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/s5o47rl89a9oegii5o8legmc48/62343692866.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9v2lihq1gkfkuh7ndkj3gueg33/13929622279.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sh7bp3erdbuhdtivssm2nrq44e/kupawovixizubijuxetefiz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/af102ad82a7e64517c1efe8879b3ffd0/98088843293.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/besunusinosaj.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/dosek.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608702f6db5cd---33542276874.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f610afd9---jafibisojilopinenaki.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kurosisideras.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jiehi6q2n9e4ejro2n04dp3io5/50134227676.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8ddef9394aca9d40aed6eb0ef6464ff3/bajidurarizurubigi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/55158298840.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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 11632 bytes
SHA-256: f36a1edf67ffaf7859a326bf30d3e0838c8c628956ca5455bc26d96476afbf92
font_02_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 17852 bytes
SHA-256: 83917d77cc6aca37cbeff57434f7aed00518be1800b5d09cdabed0bba0041b49