Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91529eb25b2f530…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 21:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96a7df0e4b39c1c550587f66aa0bab3a SHA-1: 58dcb8eedc86d2ee19e163a4c7f7db18b89943ac SHA-256: f91529eb25b2f530166113d31b781e6331ff102dcaf6167609e2e422f19aebba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those on `aliancegroup.su`, are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0ffce94e---sisepaduxaz.pdf
    • https://baongochoa.com/upload/file/rewenulakuluzoked.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/29d08595b8edd2cafd3e2a539652d151/wesoxomu.pdf
    • http://zulassungsservice4you.de/bilder/file/muronomazadogererigamepo.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f45c3e0ad---78703068282.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1176d43e---76490326044.pdf
    • http://asude.istanbul/ck_images/files/gelazinawaxadu.pdf
    • http://metallpress.info/files/pafilenav.pdf
    • https://liniagdanskzydowo.pl/files/58650278855.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39a24c5e7---80380473455.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65cc64f76---99059944450.pdf
    • http://altinay-law.com/images/file/moxizovavapixuxeduludev.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/98ab0234c95ba7084fb39dce6a16fc06/famunez.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f2dcd4tf6q1qar93ibp4fj2m95/dozunafeburomibukoxowif.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/3959755169.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8168eca64d1e7d492e6d9d6f69363a33/nilasorewuzojupavavajewuw.pdf
    • http://bocghedanang.com/media/ftp/file/22316508166.pdf
    • http://sushinamu.com/uploads/files/98162906722.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1e67ec7f9204c149082215eb9bf5a738/65253687392.pdf
    • http://coytex.net//ckfinder/userfiles/files/saruvakiwulafa.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0f10c0984aad1cf6cb7b803c84060ba/lusepezolelabufubikelag.pdf
    • http://redigonda.it/userfiles/files/36615672887.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=professional+plus+2010+product+key
    • 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_off0000e9fd.bin
81e47759129059778d2ba57df0363e3e6a4f8a0e74b07e033016e68e66be41bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16956 bytes
font_01_sfnt_off0001162d.bin
28e75888b15b16a3ac01f13943c305a91e42dbfa75edd2e3c0f98d3e1ad064be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 11216 bytes
font_02_sfnt_off000130b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 16792 bytes