Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2110feaac41326…

MALICIOUS

PDF

82.1 KB Created: 2021-07-15 11:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3364127e9a949b6d8f1400f86ae9b0c SHA-1: 3bd1e248c068e7b6cbc49d17b88413fe8a585c3c SHA-256: 8f2110feaac413263a66c67cacb2960bceeb5d4e0dc75b7cfc52c326cd59516a
156 Risk Score

Malware Insights

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

The PDF 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, suggesting it's designed to trick users into downloading further malicious content. The presence of numerous distinct hosts and the use of UTM parameters in some URLs further support a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089302273d36---jupoxugederefe.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9dc946505983ca8d1ceb5c4decfa00d3/jofovabolixanimilunojo.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d23f2f2087f55ee0869ea2e0c0fab3da/somezafales.pdf
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdf
    • https://schmitz.cz/res/file/varitovofet.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d8e4775ea6e6233aaf08622125351bd0/zigizur.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bb755f7e347e92cf22bc8db72ddf682e/razoromawunabi.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9f832e6bc57b5ca18c65e8d5d6ef1fcd/85406411896.pdf
    • http://asja-doll.ru/userfiles/file/28289305640.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mk29m5i4tdkuol7oktlebe02he/2836294749.pdf
    • https://ht-cooling-j3t.com/contents//files/56996005538.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc6e45db8---gabolisajujo.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/24277024478.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8acf0b7894f3f8a359ecfdc8e2a38600/fukujoxif.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d19ec07d080---83821677105.pdf
    • http://ccsl.asia/files/mojunow.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a1955c51c287b3761b6565534829d7cd/98374996230.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a5a24148bb2cc0e88a0a8d7f9ad58039/nibidegezolaxevorumewetor.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4c48d0a3---23653967114.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0ba07e64934847e7a8e5ecfc7ffe262a/jufuputor.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7b5c5d7f54bccb4dbf6e0be4fe8fbdea/jovivolotonapaduzo.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c29eb02e844437ab22c3f6d75d0a1eec/guworitakosanasako.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ogh34u747ghro2rb5c9sqbh3i4/maveg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+overdose+by+alessia+cara
    • 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_off0000ddd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
font_01_sfnt_off0000f5e6.bin
ab242530523a9a42f6b1f6b2539aff27164a1b3cdbdfb1b6cbfd48bc8a0f7d01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16968 bytes
font_02_sfnt_off00012299.bin
657562ee88951a559faf28a79f323f2870b2de621d6b866680c1ae293d78f9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10672 bytes