Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fc48bc5c89a197…

MALICIOUS

PDF

69.2 KB Created: 2021-05-28 15:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e971f2e6e81ef5f62325dc330f533d1 SHA-1: f0a3153b4b552a0e5d01cfe06bb76075f9b2da0d SHA-256: a5fc48bc5c89a197ace51ea3be3c86f08b84bddd85753d9f19aff0e7028eb321
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be junk data, offering no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46d60fa61---muvefa.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/pemujobixisibuduzubonolad.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ba49a1d70aa531faec2dcc79c14a76f9/sugunen.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6a676b800dd1e583d02800bf19cc1024/bolinaru.pdf
    • http://sugarfree-gelato.com/upload/file/zevip.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b93c6926ad27204cdbb5be87c8f17a1/matop.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c9432508fc6875821e1bfd0c6056674/pabibikazawamekikujareva.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lj3gepum6oblrcs28anovbj9nb/mipinowikakuli.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f545bfbc09f09f74f836547b0ab8139e/fibugel.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/69487606305.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c937c83077---liwokilalatalitowove.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/656c87847002178fe5d873e72009d1c9/vuwuxevowopalozeto.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/cccf37a1600561b38a04eab3c5f2cccb/fibene.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afadbf538cb---81821513162.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cdb17ffbe---pawemaxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=1+metro+cuadrado+cuantos+centimetros+cuadrados+tiene
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c430.bin
b6e24c1ff8ff7d0299aa1b2fc15b45021626598cdf4acb4f9c8ced5a911c2e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 4892 bytes
font_01_sfnt_off0000d4ad.bin
cbb20482d2a674d702316918fb86b8382038715884eca87d093d65e4bc983221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 11212 bytes
font_02_sfnt_off0000f8fc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 4324 bytes

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