Malicious PDF — malware analysis report

Static analysis result for SHA-256 9663cf91f8e20699…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 07:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7f69c14f43d61372fe624e46aaae45d SHA-1: 0d8096f8b1142d1bc1518162cd7fd2bf5b7a602c SHA-256: 9663cf91f8e20699cf475fbf54b1479d2a0e77d552581e8d176d288907fa1ab2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and external URLs, some hosted on raw IP addresses. The PDF's structure and embedded links suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=equilid+bula+pdf PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dab8e8a77---tupig.pdfIn PDF document text
    • http://fitviewer.biz/files/file/64013689590.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/68167760977.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/52083925022.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/6635263812.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/44233993873.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/fogolajemofalivuzig.pdfIn PDF document text
    • http://texmet.pl/userimages/file/gabubapinakamiminawe.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b23a7cc470ef2b4b975950192dce45d3/24105264693.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8460761b4---94009596533.pdfPDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ck6k96t0slbg2ab4nofan1hlce/gesiwaxodosulibize.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/zerebat.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69jaf7mr8m82f9c0cpeufaq865/xatavutoworedobe.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/65343781180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d25e3661---rewefixivodipobepol.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/902f91743926f3d2abb8c41eb08d1d00/46257648468.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/lawigibepudomato.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/55401770961.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/zinupumizofajotab.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/96d71b3b154f7cf85aac89581df49925/10619690256.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/mevowebisimawebamunanavu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/19262380802.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rcm90rnfde4ek885uqt41d7hic/pidukozixirozowulomogaxez.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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 10140 bytes
SHA-256: 88df7dcf1ea293c3215c723d7b169abffcf9b4e3ade5495e105a69b22f25bee7
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 17932 bytes
SHA-256: 5bc7ede87d19cbd589a6a176154e45819969c91af4001578e25b249a0b77e389
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1