Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd58a264709cc34…

MALICIOUS

PDF

153.1 KB Created: 2021-06-26 16:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf93450925d70d863c95b9a2b5ccbb4 SHA-1: df4397e5d32643ffe1dda4d7cfeb9b5141dc6f3f SHA-256: abd58a264709cc3421adc5f75e8c4ddde28b2edf9c5f83b1f9e9b00689b225c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, functioning as a link farm. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://ketchas.ru/uplcv?utm_term=fast+and+furious+tokyo+drift+soundtrack
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900aaf0765e---pubejejof.pdf
    • http://mrbossamktown.com/uploads/files/84633749977.pdf
    • http://hodori247.com/uploads/files/lewigabixa.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1671ca9dd---rolatagavaxinominokerere.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5250794a---fikosizimirelisiw.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9832c589---vobaz.pdf
    • http://kingalbertltd.com/uploadedfiles/file/74257396517.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d351304e---27804298809.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515120149942486.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i91tc2u0sfghg1504eptk7nq7b/sevuwumuxowudoxakileriti.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ro2vikqorqiufgb4bnckc894bd/45121038084.pdf
    • https://decoveinvestment.com/userfiles/file/kifik.pdf
    • http://palaciodelosnavas.com/userfiles/file/39270477573.pdf
    • https://brianhigbielaw.com/UserFiles/file/38929760682.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44b8ba64c---15309835563.pdf
    • https://foundryindia.org/userfiles/file/12751802537.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/628d54f89d3e5de3b9930260f743471e/1504606331.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/87579195103.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba2ed96c356c87fb2f9e63e232b78f0a/xixorev.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4fvejiqdbmluhf83scud9pmnce/80917577843.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085607b16fd7---bawejidusaruvewirit.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/16334830634.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d2b8dplmahjpuak30fsdo1sru7/66797078991.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df025ed38---83747750036.pdf
    • 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_off0001f1ab.bin
2f9cd213f8d7dbf2b3b5b664e4620bf439d9a2c0db3f55b5ec1dc188030fbecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1AB 20048 bytes
font_01_sfnt_off00022614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x22614 16792 bytes
font_02_sfnt_off00023e2b.bin
109d6283b7e2d0c6b4045d4c504790af8eac0bd3f7a4a57806d491cdeb1144fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x23E2B 10576 bytes