Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c63bd9e0b10ade…

MALICIOUS

PDF

73.6 KB Created: 2021-08-06 15:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19254d1a35c90e25c5a8da2ae736cd10 SHA-1: 5468ada4eeb23c8427e4ad93a85c7609d529db85 SHA-256: 27c63bd9e0b10adece866519b456e8d829acd8a50f1d63b357bee05f2c020702
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://commandhousecreations.com/uploads/files/66418627375.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/0una3e5b35ubfn7tbiq6ivu1qu/xuwujiperulasimeba.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8561bc4ef---manadilavope.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/70811125947.pdf
    • https://scavilecis.it/userfiles/file/lojesotusadifezujo.pdf
    • http://driver-jazda.pl/upload/file/39144302676.pdf
    • http://yokohama-model.com/userfiles/files/59745325823.pdf
    • http://biosite.ru/images/news/file/rikifonulokerugusa.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5baebe2cf---91698175685.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4dcb00e1---61592576532.pdf
    • http://cocoal.com/uploads/file/gonakisasaragenifaditu.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lepagudunetapusikomajire.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aff98a0f75ff9a94a809e4119d4fb88c/80963301445.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/53359330121.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/72dfdf91d7ac12ac4506e9c2cd17ffc5/79961921691.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc267588c3b---janivemiz.pdf
    • http://itkaufmann.com/images/fckimages/file/rigejuxuge.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fad5dbd01b1---zelogisin.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bfcff39a2---gulevatobezebotagunux.pdf
    • https://biholka.cz/uploades/userfiles/file/47235255565.pdf
    • https://zohopin.com/calisma2/files/uploads/58118544075.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a039c874---35074039315.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1p0j29oq7sm26kodimpdqdhiru/4008610426.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=eye+spy+activity+sheet
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfd1.bin
687b7c0e738cdd776e62225b9f02eca3e34bb8297de85956c4e2a99e32ca644d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 15360 bytes
font_01_sfnt_off0000e724.bin
79e88b42afba929ad5e1db3fc84fded837c35a7c1b0521516a50030c02dffa3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 10264 bytes
font_02_sfnt_off0000fe77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes