Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6efe19126f9f515…

MALICIOUS

PDF

77.9 KB Created: 2021-07-15 16:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4410c07886256e6b4ca7cff3aa68cc0b SHA-1: 76b55764d33e3acf6f565e6b14d6f855892af1c9 SHA-256: d6efe19126f9f5156974b28210a21e76eff6ebb7d600d24ddd9bc6b0bee7fd56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://abacusnancy.com/userfiles/file/tesaxasigudisesaxasosakog.pdf
    • http://ajivikafinance.com/userfiles/file/81863300717.pdf
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/wiposuvin.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s127ljq14elraf2a2ibhf3jg2g/dopowarenoxevev.pdf
    • https://balaji-technology.com/userfiles/file/78328221909.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/g2tc5hl9qe9cvguif40lbuha8p/nojirobuxif.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ec8cdca9---finonolerid.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/15ba3f994b1a70281bd3e7c12d1ddf20/mijigekoror.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529174439108797.pdf
    • http://blueyee.com/upload/file/311118241870.pdf
    • https://alternativecarrepair.com/userfiles/file/pevixe.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/10554c63cf9290b77ec040de4ff49654/gujedubudujoditamidigus.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/79859328494.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g5mas4fkib6qbnmhjshrc8lahp/24533722553.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06bad8483c---sasibapejufizef.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb69f82687---28588377373.pdf
    • https://suma.ca/upload/editor/file/76966683509.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7bcce3726a53378e7ba09fd90dbe0bc0/3596784222.pdf
    • http://nktrading.qa/file/files/gojejal.pdf
    • http://bigredclassof1960.com/clients/879476/File/kadikutafobi.pdf
    • http://toyteepee.com/uploadfiles/file/2105180056134086406wgiik.pdf
    • http://anvlaw.com/userfiles/file/fumovuniwur.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce43200f1a5bb22b5da4636eea2728f5/34585282897.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=express+110+as+a+product+of+prime+factors
    • 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_off0000cbe2.bin
331d66d7d02030cf3d9ff332e84a18eae0a783213b893b37bb0a22113d02d304
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 17004 bytes
font_01_sfnt_off0000f885.bin
0811561f1f7fc9835db495d904ddaa443725bf8e5cc353fa1f2522ff14964984
pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 10988 bytes
font_02_sfnt_off00011226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes