Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53704183ba0df93…

MALICIOUS

PDF

80.8 KB Created: 2021-06-29 20:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d87f497ce0f4d1a20ca3c19cdfe14a98 SHA-1: 53d4d455824daff8c391e5279ef5e94081895ff6 SHA-256: a53704183ba0df931de518ac2c1c5cf23001ae9a881e3189faeca2ecb5a9ba52
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a link farm designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vitali-schulz-eiskunstlaufen.de/userfiles/files/73018896735.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/42080c9cf94ee6de6fb08a95dd147fe3/jaruni.pdf
    • https://alnahamgroup.com/userfiles/file/46493717096.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/kewinonoxekizunu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081039949a57---vigenezulona.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vip3plpefgegn1k5fjnd90fik5/napiwi.pdf
    • http://drairtools.com/ckfinder/userfiles/files/18958903763.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ev8q9hdeog9pddm8b3oqmveg46/sekakoriwigituvigalimevo.pdf
    • http://munnarinfo.in/userfiles/file/konexuvurutobawupugul.pdf
    • http://autoscuolauniversale.it/userfiles/files/wofanatizumowawedonopibo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094881b66182---bigalilikumobuka.pdf
    • http://csc0731.com/userfiles/file/20210619205753_uuirzb.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/iq5etqsnc7bupoj8hgtmrpj8ga/90818697252.pdf
    • http://www.deopendeur.org/imgUser/file/12970695551.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/if4s6mafot3j9tpsk3mgc2n8f1/fetelabegexovunonejibij.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d16ef29---65248298177.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fcaa9073e3c5f8629b6bb49bacd220f9/81748676340.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ca7778a5fda54b052a9ed8b3fab74667/66448803710.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p55aglv1jsbf4u5ds041015de5/jamaxiw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099cee37e1a3---gaxiluwakoji.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/31b58c6b11d10a19ac1e9565bd6ea948/42600112475.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8d9b42ac---22394421853.pdf
    • https://asset-books.com/userfiles/file/90929978707.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nate+temple+series+books
    • 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_off0000d88e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 16792 bytes
font_01_sfnt_off0000f0a0.bin
562315cf4c1b15758215392fd863163e0faf54d3114824aeef3ebd7a82fa4639
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16900 bytes
font_02_sfnt_off00011ca5.bin
59e5665b552996062859587f024d465ad96b6556bc4f4a2d4b2da689e8ee852e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10516 bytes