Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ef0843093fc823…

MALICIOUS

PDF

114.7 KB Created: 2021-07-29 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e71d9afd58592a76c25bb33bc9962588 SHA-1: a17dc28011f145c17c0f0ec5392a37342ad7b439 SHA-256: c7ef0843093fc823981ed8351295df4beeb1a62ed84d3615e3f9c2539cc785e4
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to host or distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e66450b1---saxufupudaroduwakepogida.pdf In PDF document text
    • http://snotlicker.com/clients/10243/File/35115085320.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75858fed5---26582363007.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24fcde564---bewukugaf.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160902513e7664---11347936088.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/94350953065.pdfIn PDF document text
    • http://krzeptowski.pl/file/wodosolatanezakaw.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/17a03d8e18a9052c010d7d5440efba85/47203468220.pdfIn PDF document text
    • https://datajournonepal.org/files/mewerizuvoxud.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/78944593019.pdfIn PDF document text
    • https://baongochoa.com/upload/file/22571437632.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf17f3c076a---tevujiwuvopizuzuj.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/8906514568.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5280b7e9a---16465356092.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e855d1a08e6d2e94ef6fd56ae74c45b/79783446754.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/3753115030.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/hd06nko9dsvhsp69543iaf83f1/fovunakavo.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/dimolunogesirisele.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zaduludifunuzuzo.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/30833691639.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/51824288140.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/zotaxadusuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=samsung+one+ui+2.5+download+apkPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015b8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B8B 18032 bytes
SHA-256: 3e6cab3940bdf9e67c6d23650970ba0952295d27933e166cb7f5747a37f7b145
font_00_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 28640 bytes
SHA-256: 26648374427f41c2555fe830247a0cc423158a9bf0231df16dc275c820bd6b92
font_02_sfnt_off0001781b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781B 4676 bytes
SHA-256: 67399881d271093b06443d64ebc981f8de69626f5671e0c5a6a9969854c7620d
font_03_sfnt_off00018907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A11E 11212 bytes
SHA-256: c3e80d9f7d3fb19512363f12ae8d9482c8f5f0c13da0f144708c288ef11283b9

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