Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18fd7158786eee1…

MALICIOUS

PDF

79.6 KB Created: 2021-07-22 19:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5f10c6bad71ebcf33d188b330a9cd99 SHA-1: 4c94629d2ed8295dfeefcf76b0ca7aee2788a5ce SHA-256: d18fd7158786eee148e3e1d7fb81b5797f81f9954aef5b23d56cebc503a7bbbe
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for credentials. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/eepj4elkraagto6s9u4l6c2bb0/lalosiwawezofodepidage.pdf
    • http://maroba-zirndorf.de/file/9839343322.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ed1a8b82724717123f96bfde15f4078e/besanedexobux.pdf
    • http://jaatkinson.com/userimages/milaf.pdf
    • http://ebslang.net/_UploadFile/Images/file/mogawasawezolexapadufero.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ff843a682a9139222b82d7db1856f597/85350148700.pdf
    • http://www.toptehnik.si/images/251350525.pdf
    • http://inannamsao.com/uploads/files/tizoxasekabozani.pdf
    • http://atallmed.com/userfiles/files/nolafajimo.pdf
    • https://angkoronetour.com/userfiles/file/51454132866.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5bfa555685b828c53052607fc3942f97/woxofejidob.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ia2jd9o9ne279a6t5vo1cmq0po/44693559816.pdf
    • https://annjulieskarpmo.com/userfiles/file/kopit.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bcdad6feba0d0c8df04d4a056f91ec17/27202251401.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607732de4b2ba---bejewa.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a6660157---tulogazu.pdf
    • http://daonshop.com/files/fckeditor/file/40827049095.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea4f2ce09d---duvirijabajutojavoboz.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b3470af4cf0cd45c7fe2b800191d6a7/gaxewiwopemixodajori.pdf
    • http://dgjst.com/upfile/file/diluxapej.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/mv04tlb4bj82kc9vti5comhnuc/buzipawedokubij.pdf
    • https://derfo.info/resimler/files/mezage.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/j0sjhne44llrb73i0200c2dut7/95936002031.pdf
    • http://roland-toys.eu/userfiles/file/89688282602.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=solutions+manual+for+fundamentals+of+physics+9th+edition
    • 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_off0000d1b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 16792 bytes
font_01_sfnt_off0000e9c4.bin
adc9ca19b793769dc3846f2f108bdb3b5ccac2ccecb8859b2db408128a8ae7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 16624 bytes
font_02_sfnt_off000114c0.bin
64cbb072cb23e28f231928ccac6a4dc0034b6d63838033a27a4f65a879c1e1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 11340 bytes