Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e77baad4d0d505…

MALICIOUS

PDF

86.6 KB Created: 2021-07-20 17:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cfee4f6a56d4495169ac829d95ea575 SHA-1: 068733f777a35c6c8cf7549a235b6d6856ac9dab SHA-256: 19e77baad4d0d5051c2b9c5e9f2f7b86656603b94e3b356a92bb526ce9b3e2c0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of multiple unknown URLs hosted on potentially compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609237255c610---68109277892.pdf
    • http://prociweb.hu/sites/files/file/matolo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8189c0a1f3---jofasojebolirijilitive.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f166c0c3---50846214693.pdf
    • https://33mobility.net/uploads/files/relowotod.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e9dd04a99---pozoguvovoravuxudok.pdf
    • http://auto-spec.ca/fck/file/fusetosodipum.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52b51c0d---96884984202.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tasanif.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/50qv3ojp89u7veheq43ih5vbn3/33841635578.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3caae854---wokorebakosorikepoga.pdf
    • http://heyumpnd.com/userfiles/file///51743310222.pdf
    • http://farashimirooz.com/files/divikimiwavidupolimakoxe.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9m3pfu4eiht0dvc6umdgsn8qlg/47918058680.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9479e156c673be194752d90291f54ce0/tixotupazoxoli.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/jiwiginalifekarepitino.pdf
    • http://tuvanluatdanang.com/upload/ck/files/xodokitadanafom.pdf
    • http://banhangcongnghe.com/upload/FCK/file/zifos.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2ape1jtmuqo7eg3qc4ajfratb8/97205543493.pdf
    • http://cn-polylysine.com/d/files/29314410572.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c7453cdf2a97a343af2b8dbd66a55d9b/42263747842.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc827bdb6e---koturiwoga.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/76399920306.pdf
    • http://jmk.kr/ckfinder/userfiles/files/78185810978.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac4cd0b915---nuziku.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/98e5946a56ab9e20bd32e5eecc287f0c/55823835432.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=determination+of+iron+by+reaction+with+permanganate+a+redox+titration+lab+report+pdf
    • 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_off0000ea39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
font_01_sfnt_off0001024b.bin
dfe63039b69a9af314a753a2d2904413a0d2ff3d3a3e6a69712e1adfed68a69a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 18088 bytes
font_02_sfnt_off000131c2.bin
3da8b128d26f0a933ab81d8ac575da386655f7d8c9af68c3b32dd60a8737608a
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 11344 bytes