Malicious PDF — malware analysis report

Static analysis result for SHA-256 71abc58c212fca9c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 05:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fbd17db5618065729c8a59de851f3ce SHA-1: 669029b953187d9f75f20f1d301da519262fccd5 SHA-256: 71abc58c212fca9cebf915ae654cf8f34312e14244449d80fd03309b4c7198bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and other disposable hosting sites. The primary goal appears to be the distribution of further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://albino-pitti.com/pub_img/file/vamodobuna.pdf In PDF document text
    • http://salkim.com/userfiles/file/movofi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ccf5eb5a144f6c1866cd8e264264ab7/7737986566.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7c6ff09ba4dceff95d9bb8e0e2a073dd/69600270491.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9025392e---68297516312.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/31d6222baa30af1555030b09a9faeec1/98766158569.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/xamerolilimevumukitej.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/julubugusazosukawiga.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4684adacc---8116741309.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609797cf24894---19357647091.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df1e1e410---voduwarowujedopuditasu.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/zalapesikagukapolidizof.pdfIn PDF document text
    • http://congtyvima.com/images/Download/56059475928.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d146b001975d073f7f96e1d62064f6f/lasapofigiwugofepogamob.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/22581579084.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fi272bk3eecqlhnn29prnq0jgu/27993174034.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kukimowujijumelejurenav.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xeromegikabuporevirez.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/75521385782.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb684633e1eeca9685a3d324510b777c/sexovasevagafurukumaw.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/31893370878.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077333e5a722---64577856146.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/peribarux.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fed5e5f6d---38381936416.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6f0f77492e25491136d3c2b02f3765cf/29797662870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=languages+spoken+in+china+percentagesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 10756 bytes
SHA-256: a0ca921d63fe154ebf81e2cd765bc8ea337a76f7191b2ae96c6f5fc783855cd2
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 17712 bytes
SHA-256: b132c562d3235e07e4a4c31190d884bf8d95d40ddd3419529006342cb05887b7
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1