Malicious PDF — malware analysis report

Static analysis result for SHA-256 356579778a10e145…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 14:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 159d0ef9b875861bb068827428084235 SHA-1: d1f5acd338ed3792dfab6c5e92362a2f66bb08b6 SHA-256: 356579778a10e14586f8aee129d6405dd895ce94bb683423448915ce59e685e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfdd0be38---52264370546.pdf
    • http://khocabien.com/uploads/files/94435930136.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/nosugu.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/795ddced96dec16884979153918c76ac/35454465474.pdf
    • http://frappsreagent.com/upload/files/daregavatem.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/b0aj2v3hm8anmfn378sv4htfq5/2284411375.pdf
    • http://brlairport.com/images/file/vibevatupifuzavupurisem.pdf
    • https://baptistfriends.org/media/56375289242.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883cd4ff4f---34074220217.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a8f6e93f---4457310295.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401a18e36f---94311882953.pdf
    • http://harnettcountyhba.com/userfiles/file/81364687424.pdf
    • https://theurbanthinktank.com/files/72560743890.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/53rrpanbktf8euiipghikh14p3/92622602503.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4d8581ebc2f59dbb1e3b3259e9e7e44f/rekukipot.pdf
    • http://bebelino.ru/userfiles/file/mivafamamotepusovovuvafap.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210801224144.pdf
    • https://pasarantogel.com/contents//files/zaxolutizus.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fcacd00d7---maxunorabukodakovo.pdf
    • https://rosycaffe.com/file/zixonujedenudobulogisaj.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2e469a92f82a0d82496ee1658d43ca5f/33320238723.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/118dbce3f45b91fb1efd2b6fb5e8bdd9/bokisogabita.pdf
    • http://springbook.no/files/gulegujixumimidamal.pdf
    • http://akicgiyim.com/userfiles/file/wezedoluwog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=d-link+dir-300+manuale+italiano
    • 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_off0000c2b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 16792 bytes
font_01_sfnt_off0000dac7.bin
5161f3a88e5fed501a8d0fa4ab2b21dcb7079a4e1232afa84fb3b952cd8c2785
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10764 bytes
font_02_sfnt_off0000f389.bin
0ca1e821cd3fd14d5fe9687b013d7b5eda0ab77e244a258fe60477c7f688cd0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 17736 bytes