Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd403e0f52ceac4c…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 10:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75f02bfc5fda028176fbeeeee80783be SHA-1: 259bddf10041d29ab7ef223ba62e738f6d5d3a5b SHA-256: fd403e0f52ceac4c7447e517c7ba392b6c6cdc2b4cc2d495d160fb26fae0e08a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080656aea219---74962900980.pdf
    • https://burgas-remonti.com/userfiles/file/6982455564.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c99b3999---mepesebukuxer.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16099e70ec1c68---laxobutivosoxuma.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4599c693001eb6bb72b06eb663c33e73/90788299550.pdf
    • http://aucoindeshalles.com/menu/file/50763246850.pdf
    • http://ahkjt.com/upfile/file/bisoduzubit.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/84f1ab459a26afe648bff3f1746e881d/34096862913.pdf
    • https://sealskinz.ru/files/file/divikubewis.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9593b4e3f---vizarajufemoguwazumubiru.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/da3ea3b956b2732d80476b892762ef2a/lojuxofos.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mguc47ptg7i2anoaju2djfj75r/32666695088.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cd20c7ace6a9a0b57d8e950cf5aab2e7/92050799281.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/54163309443.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3puo36rv36tip5vjhaj3e2sd46/fomakumugurizi.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/85418492090.pdf
    • https://chmelo.hu/sites/default/files/file/tanudoxiwezox.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e5688527---18689213043.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0dfdfea1---pumeridus.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/77938796920.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/93dbf53a7b6280a3a8d3c926d9720826/wegoj.pdf
    • https://dietacud.eu/upload/file/wobujajar.pdf
    • http://atut-biuro.com/uploaded/file/13611568831.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c962b78a311---35431151356.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/togux.pdf
    • https://mauspro.net/upload/files/42188668769.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=criteria+for+credible+websites
    • 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_off0001062b.bin
6c858c765a6d0c35d82aa136b2a3106e9bdcda8f663045edbe64ca59b24c3de7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10624 bytes
font_01_sfnt_off00011eb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 16792 bytes
font_02_sfnt_off000136c4.bin
d35aca0154e6156222a8b13cfb06e24de0447f40eb27e0f802b3c57bee0d89a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 16896 bytes