Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff6a2c38d822819…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 19:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93d1ed71c15689324e64c8c2c7d0290b SHA-1: ed4f75e49ba5c72286d8d8434021ea671cce019e SHA-256: dff6a2c38d8228191a5040f0983e82e60d10ea88ee6b53eaf52cae1ad337b149
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ef581e10---6369757692.pdf In PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/32190735962.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb5b22ef0---gonisiti.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/86483870536.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d769262faa2798378442d1dc298968e7/demafabunepafa.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/domibawodovaxezemexen.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k5f173h05kklcll5d51hsqn0q6/51338719434.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/zagoroziximamorukebok.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91757688622.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/63474772458.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077836681630---sotejurupinobajarule.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04d03a561---resuvu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/52907616009.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/51244779456.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/8266758046120f47860e45.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/86307141764.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/op0uojmdlfp4a0c5i730mmpne0/60568926404.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/75608472687.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2211f92ba2ec6768f8647e59e5260ce6/7210321247.pdfIn PDF document text
    • http://orem.mn/uploads/files/kuxebokuloleriv.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/68948046883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+free+pdf+portfolio+layoutsPDF link annotation
    • 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_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16992 bytes
SHA-256: 28100a4a2ffb5e2dd4d668155f165e10862854ff1e1b29e64b0b021716996050
font_02_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 10792 bytes
SHA-256: 65fabf2d308052d8fca12306a38fe38c5049b0e035c3c22b62aa0c0f2c5333f8

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