Malicious PDF — malware analysis report

Static analysis result for SHA-256 136b4475da958d56…

MALICIOUS

PDF

83.3 KB Created: 2021-06-27 04:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0540e932a200f9cbe67e5588fac064d4 SHA-1: 612cb8ec7e777b3e75dba44ab313864673c93208 SHA-256: 136b4475da958d56856dd398a485d853d8a8bba46719c3ad3d5594854f7c8ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, often associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://paulins.se/anvandarbilder/178/files/bepidilikekeduwi.pdf
    • https://nepalimodelagency.com/userfiles/file/kuvorudesa.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c7660a1d944f720d0a301df1a4855735/nosojupo.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71a42f9c0---27234310919.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82c862f1a---fanowawusunerudelisirasug.pdf
    • http://reutlinger.pl/userfiles/file/84860199.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/wiwofepusakabasok.pdf
    • https://navliecky.net/userfiles/file/8453149501.pdf
    • https://sanruouvang.net/images/uploaded/file/tajisuli.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c37666266---96772186701.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/70d04623a1899d623896d1819f87bc13/86284493118.pdf
    • http://championsview.net/userimages/batimorolat.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ed44ebb0---sileginuvisujolukawuf.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d3020738---rorikivipupepebuzotelezo.pdf
    • https://deniz-sogutma.org/img/userfiles/file/87193463614.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077127ed97e1---mesit.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d314ac774c---lagurojabaforikubufulop.pdf
    • https://dusunceokulu.net/resimler/files/bafojigasobububajafose.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6f860490---wuwodidifewifewika.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6807064aa---kazapowoba.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fuzetuwiruriwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ghd+sports+channel+live
    • 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_off0000dd40.bin
0f7b3c4130c061a52e7b40190faa82f9fb7c769cbd4ee45e08190b1b60da1a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 19636 bytes
font_01_sfnt_off00010fe2.bin
a6cb0bad5de68712c62f9f5f382c78167bfbfc2c7eb37e537dcddc926093ffb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10716 bytes
font_02_sfnt_off00012876.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 16792 bytes