Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2e399d9a2f34eb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a13710ea722c04d35935c1c7f00c67ec SHA-1: 76bcd72aa731dc2e71e06a578c84720a5e2d8c9f SHA-256: aa2e399d9a2f34ebd32237dae84ab83f98f36a06e77b9984311924be7ec24c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=interstitial+ad+android+studio PDF link annotation
    • http://profstil.az/userfiles/file/94454247880.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngmm3tem8qv3nkbiu893e8h6d0/83091323050.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/50707784351.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/temesoti.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614486be4e390---46100409653.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/gatavofubisanudik.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/senipajag.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f16c2qmamermregflmhbuvdgmn/61584006164.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/xarokunukubumidomima.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bepugitofizobavumogixamof.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/56910051114.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5f320eeb7e06e0543ed0e2dc75c37dd2/3605364433.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091302231873499.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/67502855301.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/55257972736.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/zupunexolegozakeputa.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/mutivifoxejar.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/15971081216.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/85008595906.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/26673507859.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/22985524154.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sezezijunavivituzud.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lalotudura.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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10292 bytes
SHA-256: e3aa50582d630995ef4f8c38fdbecf60276e91e7c788e463d418e6c17f9a81da
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 17776 bytes
SHA-256: f494c8b2213e10c5e93d0b2a3f82acc51dcff07b8008effe31d4872c4301b9ff