Malicious PDF — malware analysis report

Static analysis result for SHA-256 4504c7fd65cafedd…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 12:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb004cd4f81ce0456f28e65116c9bd31 SHA-1: 0c6d958cc24b7698e0fc1fa620d890ab694cce76 SHA-256: 4504c7fd65cafeddfa5243f718ec32da8dab23b14ffc07b09feef4ccf70a581a
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, but the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb19683f2---wafulunagasip.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0060hggglgtr76397hukia9a51/54861584684.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/liv2c34ib0nkatj675b4hbm0lr/vibobevojaridofakawijili.pdf
    • https://pbchistoryonline.org/uploads/file/85004482984.pdf
    • http://learnazia.com/fck/imagesfile/93682133291.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac131d17bbf---rerematobijajat.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a5cd2ff0---9082568987.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2jcckahq3l08ecut4o7fojkem3/gonakapuxawefu.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e582b495d56745cebbcdec9c5cf8f7aa/salafopimewazitumadefogaz.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceab4256e5---gogepe.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160baf386847d8---29076725056.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00767b8a43---rajiwufosabomax.pdf
    • http://nensi.si/upload/file/88925627740.pdf
    • https://ahreco.com/uploads/news_file/82634243533.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m65taa97seduq7lsdf4vkntrl3/solezutomudapavoboguno.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vgt4hf3msnfj8vh3m8q48ce5s1/dabutaziwemogikuzevidava.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce5a1f7c8---86782596974.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b024a709b9---nokabugamijuzilinusu.pdf
    • https://imagebeaute.fr/userfiles/file/92630916325.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa26905bc---jopoxafajazozoma.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1a8357e4---talab.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a0bbf2c0---46229609526.pdf
    • http://szentistvanpatika.hu/upload/file/19504799457.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ems+speed+post
    • 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_off0000f357.bin
f0047bf7005e491b92f7c94c6429b7725e614e6e6b9421b1418dae85b9ae3838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 10032 bytes
font_01_sfnt_off0001099d.bin
e20d30ed9b043a851a2e083d9c151032f054b713ca2288f4fad0ed13e336a5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 19452 bytes
font_02_sfnt_off00013ce5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE5 16792 bytes

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