Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121185670be7b0d…

MALICIOUS

PDF

72.9 KB Created: 2021-07-19 00:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6280aab82aa59f516de4fd88812a6eb SHA-1: a4b46ee9d85324319c384bebd4ae7c7825b47cf4 SHA-256: 8121185670be7b0dd2cd7be3fd366dc22e80698491526d834b3bffb870afd4a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure victims into downloading further malicious content. The PDF structure and embedded URLs suggest a phishing attack, potentially using a social engineering pretext to trick users into clicking the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b7848e805ffe0126891200e65cdd20c4/28223419371.pdf In PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xamifogalureman.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/48286892364.pdfIn PDF document text
    • http://93564497.com/userfiles/zuririxajugi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/65215209831.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jasawigunoxopa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5c4acb0986600b24dd2ddcae693328c3/51710474280.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/61236766309.pdfIn PDF document text
    • http://albesiaboutique.com/files/upload/files/miwebovudamamatom.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/68893612194.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849f38b60e9---41325157470.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4579631402.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tm2077rs2p8t23sqh8p5jmviu2/3841681696.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/59614363332.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210708_F74697038CB6578C.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mpjpqgop6nsn8g9akrcmsenjl7/98071519553.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/6a9qd2d80fo7ea5e9o0h4c8c55/jipoxima.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a16b44d79---38991454874.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/40513895083.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xijexadiko.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1becf680449ee7b457002c79f4319293/wobazuvenarobalu.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/15915096851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=knowing+bros+251+eng+sub+fullPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9da3fef17481ce65020086d3d5fab7e3/28217998493.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 15876 bytes
SHA-256: 2666490ecc7dbd5761c0568cd246e73b6dde80f1fc054ca7141994d4bd7e6ddf
font_02_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10752 bytes
SHA-256: 0ab28153aad44834df26e3a7df7e5808901e10fe136a26419df8c1a1f14069db