Malicious PDF — malware analysis report

Static analysis result for SHA-256 a203da98f6618fb1…

MALICIOUS

PDF

142.1 KB Created: 2021-07-04 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f34451b47754a65a94b133d1ef71b743 SHA-1: 60e325cc037df32b2463f770c875e7ba47edff5a SHA-256: a203da98f6618fb1d466dce1b8908b6e3fbc261da87da2c636953f5b783c400a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bcb4be419---timiviwasabuwopuxog.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9a396ef0691f2800115ae5905a93dd2a/51846193972.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/55875215759.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/52769d5fb719b5692f8b11567d0aa369/7433674528.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fawali.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/70a8483b76c38c3d3f716034949beb27/siserove.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/633a9a35b6c77383f19a22a5c8d0eadc/wirolupirozufatagaxa.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/819231419.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e725f23e---votawatesofisuporelamon.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/88a4550762a5d223854426c48aca5b77/xedufonunufumuk.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff8a62e59---47717333043.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b3616737d2791e4ea75aa7b422525301/wugamagapawugunawir.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/l7km0aoc8039h6pjapmmee2f4s/50854286052.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fdfd04c7d---89490452826.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc5eb4318---31261495510.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/95562420986.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da374f1e4cc---61640003751.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/xibevokofavo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d579a1f0d71084e1a525e0dabb8e15ba/visibuzapekobupup.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/93646415680.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062602505373499.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3093753e2---tavapidava.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c9c373b7---5756895695.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf532db142---lenozewugegiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=to+form+a+more+perfect+union+meaningPDF 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_off0001cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB35 10672 bytes
SHA-256: 8fe65d36a9e527af3aed698baacca620195f4b74226be61b1d253b9b43c80729
font_01_sfnt_off0001e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBBD 18404 bytes
SHA-256: 4d69872822f8e9af2f7ae4e0bd053d2a0250287244c635fdf2941e1c2ed5260b