Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eb91c8b5bee431…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 04:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ada9996c8b6765d4ea8e47c00f6b93c SHA-1: 9f1708b65f710a470a765759b464a9b5cf089922 SHA-256: 48eb91c8b5bee431543ee3447354cf09221d5a9f79b26184e036df1b9ef57e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. This suggests the PDF is likely used to distribute further malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ohappy.org/userData/board/file/28641243933.pdf
    • http://thevisionkharj.com/userfiles/files/fawor.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sowifekodirabowiwepume.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de6259e4a---7666069029.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c8b71b318a80309a42c1498a32b998b1/mipolanetoxamuvugoselas.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0b209a4f---21835257688.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4898a8794ff2dba7fad65654fc0b6b07/30972943062.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a5b304caf0118634b9f44aa163905326/sifapikabujelemejanano.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/9836619281.pdf
    • http://unicorn-furnitures.com/d/files/48626094472.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/iqihgbp10srun1o9odh4nm4he3/19842234068.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ime2tsu9mp37t3l64no4m8hdlk/mafam.pdf
    • http://kraski-chernila.ru/resources/file/76575931860.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/6603398131.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdf
    • http://ahkjt.com/upfile/file/jifosalesulufukix.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ddedaf36d7acb61e0c65066671f219b6/bizisu.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fad5262fa---xotusedavebatave.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c5392b5e278d005af2e237ce7677576/kotasajiliw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2dd929cb6---vaxilosuraxubenuxaw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb8708793---fogesawojikaxi.pdf
    • http://tfh-filter.hu/_user/file/23705786389.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=physical+self+in+personal+development
    • 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_off0000e884.bin
a74b85c89a9f3f60e047df3f1b8f3bad974c707b9612e2ac6b6c98393caa3c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16596 bytes
font_01_sfnt_off00011355.bin
09ac884f2d01796a5b91de999e344639d6b91a055f69651493db750f3a6111d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 11068 bytes
font_02_sfnt_off00012cf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes