Malicious PDF — malware analysis report

Static analysis result for SHA-256 44df84a0f8316cd1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 01:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 546929dcd30cf5dc366e59ef2c14b5fc SHA-1: 51c79f612628be0e0aaca150d24958ba42c5d4f1 SHA-256: 44df84a0f8316cd189b3396d4978ad224cd4786ef38f44eb01cb9dcd8454a424
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of a 'download' button lure further suggests an attempt to trick users into visiting these sites, potentially for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=free+mp3+download PDF link annotation
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/84882872676.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/56741166037.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51a3360a---87597715824.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c699a1c11521527e7d7632b88e24ec31/94975664786.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/bivowaramixizijefotuvar.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f38ed208205af75911f298315629dc19/79989337300.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/dopubinolamubemazuwukota.pdfIn PDF document text
    • https://istanajp.com/contents/files/visuxiluzalojutimemej.pdfIn PDF document text
    • https://hiroyoung.com/data/files/lurarazugeroge.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3eda5f94f---75169752698.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/18052685697.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c94df1b773c4ecd03b69bcf5ff7aba38/migivamesuferad.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/15155084966.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/japerarimaninadogurilur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f260cc3232---41005697548.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cc996f95---67989151611.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66829769231.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/putisufasotaboma.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352347161f0---79622025146.pdfIn PDF document text
    • http://tulga.ru/editor/files/77468619377.pdfIn PDF document text
    • http://carbontuning.ru/file/47431162600.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6d7762e---47570289414.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/30063642537.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6136f18cc688c.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/korubemilifuxovas.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/penuzozumaj.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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 18476 bytes
SHA-256: 5d7563247f20d4d061584f704221569227e08d55324f29391586e51b6b1bc382
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 10432 bytes
SHA-256: 4d4d2b311e0ac14889148736f54184bc1bd74e67d6cefd0cb942f2c107187498

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