Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e25860ddb6bdd9c…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4fcccfc5a5274fce02ed70f3ff5f6bf SHA-1: 01111a31218d781edba12e71d7c4d98495566e04 SHA-256: 7e25860ddb6bdd9c1a6859e7e68580ec8c884235a08bec81993ba95edc54cc62
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

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 https://premium-house.uz/images/file/xixafa.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fad39daab---54430651263.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a8fd9132---vexojat.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8116c1084d---6535065323.pdf
    • https://africanresearchcenter.com/userfiles/file/42579194571.pdf
    • https://synersys.fr/contenu/file/61239570400.pdf
    • http://fluitec.fr/ressource/site-image/files/2150454675.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/80fa53953cafa2cbcacb323e8d21ade9/50722968648.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8c0efd068d061244b81f09aea3198f6/kelubodusototigo.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec8ec2b32b---50120429490.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fffdd5758c0cbd415a92a4c40050a311/lukenanakirumo.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b84b66ab47058b0cea2919c7825940ca/92019038147.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/87c5600ad0dd47b21106d962e0ffc906/62068031425.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a2b98a52578aaadcbaf18fe16d9ef655/gesopomexur.pdf
    • https://hashtag.school/userfiles/file/jimaxonuwogafutupi.pdf
    • http://armanetti.com/images/82249868814.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f0fed560c6169d636188b36a21f3eabb/22700438014.pdf
    • http://cn-junsheng.com/upload/file///2021620203035837.pdf
    • https://ctners.com/ckfinder/userfiles/files/99366104539.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7s09kbn4jv0r6d9he23l1ii7bv/tonafipurelodasizal.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a970c06930afd4f0c1563e06657a869/damiwileko.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62c875e8d---ramekutogafovad.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hhdq2hus2rt13k6qcfb7ukpg83/90505687761.pdf
    • https://audreyheselmans.com/_files/file/fubomo.pdf
    • https://avigailpekelman.com/sites/default/files/file/48243191997.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb03867b1b---4243613304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+have+the+willpower+of+a
    • 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_off0000eb2e.bin
6986fc7c5419369bc43290d37b3e330b2afc0ac388375f786be71a627f986c45
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 17800 bytes
font_01_sfnt_off000119a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 16792 bytes
font_02_sfnt_off000131bf.bin
0b6b6de982c7fd1723ee1da0f89d7d5c19c21a911869ae89a172c0c80dfa7852
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 10284 bytes