Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a400420aabb80…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 13:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb32fd8d4549f9edc8de18d0a4ed0d1a SHA-1: 8b7a639327e6b4bd5adad136c74afafa8bdc8bde SHA-256: b15a400420aabb801175c08645aa41a3e2398305ab24822d837dfa62fcd36033
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple URLs hosted on potentially compromised CMS uploads, suggesting an attempt to distribute further malware or phishing content. The presence of numerous links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maasmartcity.com/userfiles/file/14612027746.pdf
    • https://whitesal.com/data/images/file/5284_20210524043205.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d712fdb336---68180800625.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/95f3c673d401b4b75c907155ab5bf615/baputoderero.pdf
    • http://hphs1958reunion.com/clients/47465/File/28303549052.pdf
    • http://skolicka.eu/foto/images/file/rufumugup.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0ocd93o5hmpbvhla5hm2b5lupo/lujuvodurevup.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1c7e1a7d1b63fd865ffc3edfa13cedd2/meniwikeseliwowedubazep.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/e99ec29a15967be840ac0e3758613b42/dogena.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/14769756330.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/537d3397cb83630d08b630c8e8122baf/87886683980.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524ed398d4---84720499981.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f78e85a43222c1e34902041943e45f56/1320117702.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330823f93f---37032901462.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d564cd58---zufosafojamuriwebapeno.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ab9354b2---52766117724.pdf
    • https://sport-jicin.cz/dokumenty/36494465872.pdf
    • https://jahanchart.ir/data/files/file/96883391714.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cbaddfa00f7c6b397e7e53e42ddc591f/74804457548.pdf
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/27793343202.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/17mn785pnhpkvttcaj25o84do4/51480639611.pdf
    • http://kulturazebrak.cz/userfiles/xuduk.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1497468fbe---39064203116.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7fa16636c522815024038535ad33d325/negatagitodifo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=titanic+my+heart+will+go+on+mp3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
font_01_sfnt_off0000f559.bin
57b97edf2d081de1691e5a8d4d20d78308d876322f4953ca3be76e3136e2be82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 18952 bytes
font_02_sfnt_off000113f7.bin
6702e3e1d5ca2560250c6fc854dcb78692330ada1744c050f3b3f56000404546
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 11128 bytes
font_03_sfnt_off00012d9f.bin
db9832232dfe627ce7b381ce544957578b7ca5f77533076d3269abbb4025f13e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 18740 bytes